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Where does Andre Berto rank among Floyd Mayweather's most dangerous foes?

Former two-time welterweight titlist Andre Berto will be an overwhelming underdog Saturday when he faces unbeaten pound-for-pound king Floyd Mayweather at the MGM Grand in Las Vegas.

Berto (30-3, 23 KOs) enters the bout (Showtime PPV, 8 p.m. ET) just 3-3 in his past six fights and lacks the kind of breakthrough victory typically needed to land a fight with Mayweather (48-0, 26 KOs), who maintains Saturday will be the finale of his career.

So how do we put into perspective exactly where Berto, 31, ranks as a threat to the 38-year-old Mayweather's celebrated unbeaten run? With a set of rankings, of course.

Looking back over 17 years since Mayweather's first world title fight, we counted down his most dangerous opponents based upon how they were perceived at the time of the fight.


1. Diego Corrales (33-0)

Date: Jan. 20, 2001
Venue: MGM Grand, Las Vegas
Result: TKO10
Defends junior lightweight title

The wildly mixed opinions on this fight -- including many predictions of a Mayweather KO loss -- were justified considering Corrales' menacing punching power. With freakish height (5-foot-10½) for the weight class and a relentless style, "Chico" remains the toughest challenge of Mayweather's career on paper, and also his biggest win. The one-sided demolition -- featuring five knockdowns -- cemented Mayweather's place among the pound-for-pound elite.


2. Manny Pacquiao (57-5-2)

Date: May 2, 2015
Venue: MGM Grand, Las Vegas
Result: UD12
Unifies welterweight titles

Five years earlier this would have been a virtual pick 'em, but this was still the biggest fight the sport could make. While Pacquiao closed as a slight underdog, his frenetic style helped him remain an attractive pick because Mayweather simply hadn't faced a fighter with his combination of speed and power in years. Floyd ultimately proved he was the one who had aged much more gracefully, and scored a decisive victory void of controversy (and excitement).


3. Jose Luis Castillo II (46-5-1)

Date: Dec. 7, 2002
Venue: Mandalay Bay, Las Vegas
Result: UD12
Defends lightweight title

Their first fight eight months earlier, in April 2002, produced a decision that many (to this day) believe Castillo should have won. Slowed by a shoulder injury, there was thought Mayweather would only improve in the rematch. Still, Castillo had clearly created a blueprint by cutting off the ring and attacking the body. He was just unable to duplicate it in the rematch, as Mayweather refused to engage and boxed his way to a more convincing (yet oddly closer) decision win.


4. Canelo Alvarez (42-0-1)

Date: Sept. 14, 2013
Venue: MGM Grand, Las Vegas
Result: MD12
Unifies junior middleweight titles

Forget what you know about the final result -- the bigger, stronger Canelo posed real danger as a calculated counterpuncher in this 152-pound catchweight bout. At 23, there was an element of the unknown regarding just how good he was that, mixed with Mayweather's age (36), created uncertainty. Canelo's ability to rehydrate upward of 170 pounds was expected to give him an advantage that never materialized, as Mayweather spun a masterpiece and was virtually untouched.


5. Genaro Hernandez (38-1-1)

Date: Oct. 3, 1998
Venue: Las Vegas Hilton
Result: RTD8
Wins junior lightweight title

Mayweather was just 21 in his first title fight against the veteran Hernandez, whose lone loss came challenging for Oscar De La Hoya's lightweight title. The brash and untested Mayweather was expected to have his hands full -- win or lose -- in just his 18th pro fight. But he easily overcame Hernandez's three-inch height advantage and announced his arrival by dismantling the beloved "Chicanito" and making him quit on his stool.


6. Oscar De La Hoya (38-4)

Date: May 5, 2007
Venue: MGM Grand, Las Vegas
Result: SD12
Wins junior middleweight title

Moving up to make his debut at 154 pounds, this marked the final time Mayweather would be forced to bend to someone else's demands as the A-side of a promotion. De La Hoya had curbed whispers of his decline at 34 by emphatically stopping Ricardo Mayorga the previous year. His size advantage and popularity also kept the betting odds close. But despite a strong start, De La Hoya couldn't keep up the pace. Mayweather closed strong in what was a passing of the torch between boxing's biggest stars.


7. Shane Mosley (46-5)

Date: May 1, 2010
Venue: MGM Grand, Las Vegas
Result: UD12
Non-title welterweight bout

One fight removed from reclaiming his pound-for-pound status with a shocking beatdown of Antonio Margarito, Mosley appeared in the midst of a career resurgence at 38. This was a fight fans had craved for years. The problem was Mosley entered the bout idle for 15 months after a fight with Andre Berto fell apart. Mosley nearly validated the perceived danger of his speed and power by badly hurting Mayweather in Round 2. But Mayweather dominated the rest of the way.


8. Ricky Hatton (43-0)

Date: Dec. 8, 2007
Venue: MGM Grand, Las Vegas
Result: TKO10
Defends welterweight title

Hatton was always going to be at a size disadvantage moving up in weight to challenge Mayweather. But the unbeaten British star's unyielding style had the potential to keep things interesting if he could stay on the inside. Referee Joe Cortez's hands-on approach ultimately made that difficult for Hatton, whose army of fans traveled more than 5,000 miles to give him an unlikely home-ring advantage. Hatton was willing to go out on his shield, and Mayweather made sure he did just that by thoroughly outclassing him.


9. Jose Luis Castillo I (45-4-1)

Date: April 20, 2002
Venue: MGM Grand, Las Vegas
Result: UD12
Wins lightweight title

After eight defenses of his junior lightweight belt, Mayweather jumped into the deep end at 135 against the rugged Castillo. The longtime sparring partner of legend Julio Cesar Chavez Sr. entered the fight 12-0-1 in the previous three years, including an upset of titlist Stevie Johnston. Considered the No. 1 lightweight in the world, Castillo showed why by giving Mayweather his most difficult test and forcing him to stand and fight. Mayweather went on to win a disputed decision despite being outlanded 203 to 157.


10. Miguel Cotto (37-2)

Date: May 5, 2012
Venue: MGM Grand, Las Vegas
Result: UD12
Wins junior middleweight title

Two years before Cotto found new life at middleweight, a superfight with Mayweather felt years overdue. Despite collecting a title and three wins at junior middleweight, Cotto was thought to be past his prime at 31 and still damaged from knockout losses to Manny Pacquiao and Antonio Margarito. That didn't stop the fight from doing huge business (1.5 million pay-per-view purchases), nor did Mayweather's pending jail sentence for domestic assault. Cotto went on to give the 6-1 favorite Mayweather his toughest fight in 10 years.


11. Angel Manfredy (25-2-1)

Date: Dec. 19, 1998
Venue: Miccosukee Indian Gaming Resort, Miami
Result: TKO2
Defends junior lightweight title

Manfredy's trio of victories in 1998 -- including a stoppage win over Arturo Gatti -- meant the winner of this December showdown would be front-runner for fighter of the year. Manfredy, whose two defeats had come in his first five pro fights, was believed by some to be a rising star. But Mayweather not only proved who the best 130-pound fighter in the world was by obliterating Manfredy in two rounds, he showed why, at age 21, he was nothing short of a boxing prodigy.


12. Juan Manuel Marquez (50-4-1)

Date: Sept. 19, 2009
Venue: MGM Grand, Las Vegas
Result: UD12

At 36, Marquez brought plenty of pound-for-pound credentials into Mayweather's long-awaited return from a 21-month retirement. But three years away from a full-time move to 147 pounds, Marquez was still perceived as a blown-up lightweight moving up two divisions. Once Mayweather, who was already expected to have every physical advantage, purchased two more pounds on the scale before the fight, Marquez's chances dwindled even more. Mayweather went on to soundly beat him in one of the most complete performances of his career.


13. Zab Judah (34-3)

Date: April 8, 2006
Venue: Thomas & Mack Center, Las Vegas
Result: UD12
Wins welterweight title

This fight lost a great deal of luster three months earlier when Judah dropped his welterweight championship in a tuneup against Carlos Baldomir. But with Baldomir unable to afford the sanctioning fees for two of the three belts, Judah retained his IBF strap and attempted to defend it in Mayweather's first real test at 147 pounds. Judah showed early in the bout why his hand speed and sneaky power still made him a difficult threat. But the prefight bitterness between former close friends spilled over in Round 10, with Judah causing a melee that nearly stole the headlines.


14. Marcos Maidana II (35-4)

Date: Sept. 13, 2014
Venue: MGM Grand, Las Vegas
Result: UD12
Defends welterweight and junior middleweight titles

Despite surprising Mayweather by brawling his way to a close defeat in their first bout, there weren't many who believed Maidana could improve on that performance in the rematch. While Maidana was still a live dog due to his power, few gave him a serious chance if Mayweather stuck to boxing. Ultimately he did, and referee Kenny Bayless' conservative style closed any avenues for Maidana's roughhousing to be a success.


15. Phillip Ndou (31-1)

Date: Nov. 1, 2003
Venue: Van Andel Arena, Grand Rapids, Michigan
Result: TKO7
Defends lightweight title

In the third and final defense of his 135-pound belt, Mayweather squared off with the South African knockout artist Ndou, who entered 21-0 with 20 KOs in the previous five years. Despite giving up nearly four inches in height , Mayweather was the one who played the role of puncher. He gave his hometown fans a treat with perhaps his finest offensive showcase.


16. Robert Guerrero (31-1-1)

Date: May 4, 2013
Venue: MGM Grand, Las Vegas
Result: UD12
Defends welterweight title

It's easy to forget more than two years later just how many critics gave Guerrero a fighting chance. The southpaw hadn't lost in eight years and was fresh off beating Andre Berto in a rousing brawl. The fact that Mayweather, at 36, was returning from a yearlong layoff -- which included a two-month jail sentence -- only fueled the idea that this could be competitive. It wasn't. The return of Mayweather's father, Floyd Sr., to his corner brought with it a recommitment to defense, and Floyd went nearly untouched for 12 rounds.


17. Victor Ortiz (29-2-2)

Date: Sept. 17, 2011
Venue: MGM Grand, Las Vegas
Result: KO4
Wins welterweight title

Once again the road to Mayweather went through Andre Berto, as Ortiz won a fight-of-the-year candidate five months earlier, with Mayweather watching from the front row. Following yet another long layoff (16 months), Mayweather closed as a 7-1 favorite over the hard-hitting southpaw. But it was over not long after it started, with a bizarre finish almost as memorable as Mayweather's verbal sparring afterward with HBO's Larry Merchant. The loss kicked off a downward spiral that Ortiz's career has yet to recover from.


18. DeMarcus Corley (28-2-1)

Date: May 22, 2004
Venue: Boardwalk Hall, Atlantic City, New Jersey
Result: UD12

Mayweather kicked off an underwhelming three-fight run at 140 pounds against the slick and tough Corley, who was fresh off losing his junior welterweight belt by split decision to Zab Judah. Corley was the first southpaw Mayweather had faced in seven years, and "Chop Chop" had him badly hurt along the ropes in a sensational Round 4. But Mayweather fought back gamely and supplanted the recently defeated Roy Jones Jr. atop most pound-for-pound lists with the win.


19. Marcos Maidana I (35-3)

Date: May 3, 2014
Venue: MGM Grand, Las Vegas
Result: MD12
Unifies welterweight titles

The fact that Mayweather was a 12-1 favorite showed how few believed Maidana -- who handed Adrien Broner his first defeat six months earlier -- was capable of pulling off the upset. But with Mayweather uncharacteristically willing to stand and trade -- and referee Tony Weeks providing a liberal stance on the infighting -- the Argentine nearly did.


20. Carlos Baldomir (43-9-6)

Date: Nov. 4, 2006
Venue: Mandalay Bay, Las Vegas
Result: UD12
Unifies welterweight titles

After facing criticism for fighting Zab Judah instead of the fighter who upset Judah months earlier, Mayweather agreed to challenge for Baldomir's lineal championship. It might be hard to imagine now, but Mayweather closed as just a 4-1 favorite in his first fight against a bigger, stronger welterweight. The Cinderella Baldomir, 35, hadn't lost in eight years and was fresh off a TKO of Arturo Gatti. But anyone who predicted he would make Mayweather stand and fight were dead wrong. Mayweather was without the services of trainer and uncle Roger Mayweather -- who was suspended and serving time in prison -- but it never mattered. Baldomir landed just 12 percent of his punches and lost every second of every round.


21. Jesus Chavez (35-1)

Date: Nov. 10, 2001
Venue: Bill Graham Civic Auditorium, San Francisco
Result: RTD9
Defends junior lightweight title

Not to be confused with the fighter of the same name who Mayweather knocked out in his ninth pro fight, Chavez was a legit contender who went on to claim a world title two years later. Entering on a 31-fight winning streak, Chavez tried his best to brawl by repeatedly getting inside. But Mayweather was just too quick and accurate in his eighth and final defense at 130 pounds.


22. Arturo Gatti (39-6)

Date: June 25, 2005
Venue: Boardwalk Hall, Atlantic City, New Jersey
Result: RTD6
Wins junior welterweight title

Enough people bet with their heart for Mayweather to close as just a 4-1 favorite against the recently red-hot Gatti. But Mayweather, who repeatedly called Gatti a "club fighter" during the buildup, handed out an old-fashioned beating. At 33 and a veteran of the wars, Gatti had no magic left. This was Mayweather's first time headlining a pay-per-view event, and his lone title fight during a brief stay at 140 pounds.


23. Andre Berto (30-3)

Date: Sept. 12, 2015
Venue: MGM Grand, Las Vegas
For Mayweather's welterweight titles

Berto, an interim titlist and former two-time belt holder at 147 pounds, is probably not as big of an underdog in reality as the absurd betting lines -- which opened in some places at 100-1 -- would lead you to believe. But at 31 and visibly past his prime, Berto brings a 3-3 record in his past six fights into a meeting with the sport's unbeaten pound-for-pound king.


24. Carlos Hernandez (33-2-1)

Date: May 26, 2001
Venue: Van Andel Arena, Grand Rapids, Michigan
Result: UD12
Defends junior lightweight title

Hernandez is best remembered as the only fighter to score an official knockdown against Mayweather, who voluntarily touched a glove to the canvas in Round 6 while grimacing in pain. Mayweather had aggravated injuries to both hands and was forced to gut out a decision win. "Famoso" went on to win a world title in the same weight class two years later.


25. Gregorio "Guyo" Vargas (40-6-1)

Date: March 18, 2000
Venue: MGM Grand, Las Vegas
Result: UD12
Defends junior lightweight title

Distractions away from the ring proved to be Mayweather's most difficult opponent during a forgettable 2000. Having recently replaced his father, Floyd Sr., as his manager in favor of rap mogul James Prince, Mayweather entered his first bout since controversially turning down a six-fight, $12.5 million deal with HBO by calling it "slave wages." Despite claiming a wide decision against the former featherweight titlist, Mayweather failed to shine and blamed ring rust following a career-long six-month layoff.


26. Victoriano Sosa (35-2-2)

Date: April 19, 2003
Venue: Selland Arena, Fresno, California
Result: UD12
Defends lightweight title

Sosa entered the fight 11-0-1 since making his name three years earlier by twice flooring unbeaten Paul Spadafora in a wild decision loss. The problem was he hadn't fought anyone of note since then, and quickly became an easy target for Mayweather's jab. In the second of his three title defenses at lightweight, Mayweather landed 55 percent of his punches overall -- including 60 percent of his jabs -- and rolled to an easy decision.


27. Sharmba Mitchell (56-4)

Date: Nov. 19, 2005
Venue: Rose Garden, Portland, Oregon
Result: TKO6

Mayweather was universally panned by critics for his choice of Mitchell as the opponent for his welterweight debut. At 35, the former 140-pound titlist had recently moved up in weight and was two fights removed from a devastating knockout loss in his rematch with Kostya Tszyu. In what would prove to be his final fight outside of Las Vegas, Mayweather scored a pair of knockdowns in a decisive win.


28. Carlos Gerena (34-2)

Date: Sept. 11, 1999
Venue: Mandalay Bay, Las Vegas
Result: RTD7
Defends junior lightweight title

Gerena, a native of Puerto Rico, was the third of Mayweather's four straight nondescript title defenses at 130 pounds. Mayweather set the tone early with a pair of first-round knockdowns and landed 64 percent of his punches before the fight was stopped.


29. Carlos Rios (44-2-1)

Date: Feb. 19, 1999
Venue: Van Andel Arena, Grand Rapids, Michigan
Result: UD12
Defends junior lightweight title

Mayweather returned to his native Grand Rapids for the first time since his fifth pro fight against Argentina's Rios, who was making his U.S. debut. Rios tried his best to turn the fight into a war and took Mayweather's best shots, but Mayweather had his way with him in front of nearly 13,000 home fans.


30. Justin Juuko (33-2-1)

Date: May 22, 1999
Venue: Mandalay Bay, Las Vegas
Result: KO9
Defends junior lightweight title

After "Goyo" Vargas pulled out because of the flu just three days before the fight, Juuko took the bout on 48 hours' notice. The native of Uganda had been knocked out three months earlier by Antonio Hernandez in their interim title bout. He would meet the same fate against Mayweather in the co-feature of Oscar De La Hoya's welterweight title defense against Oba Carr.


31. Henry Bruseles (21-2-1)

Date: Jan. 22, 2005
Venue: AmericanAirlines Arena, Miami
Result: TKO8

One would need to go back to this fight against the unheralded Bruseles to find the last time Mayweather was facing as big of an underdog as Berto will be on Saturday. Rather than challenge one of the big names at 140 pounds, Mayweather took a final tuneup before his PPV date with Arturo Gatti and entered as high as a 20-1 favorite to defeat Bruseles, which he did with ease.


32. Emanuel Augustus (22-16-4)

Date: Oct. 21, 2000
Venue: Cobo Hall, Detroit
Result: TKO9

Mayweather has said repeatedly in recent years that Augustus -- then known as Emanuel Burton -- was the toughest opponent of his career. But few could have predicted such a designation coming into this non-title lightweight bout. Less than one year removed from making his name as Micky Ward's opponent in 2001's fight of the year, Augustus was still a journeyman with 16 losses. But "The Drunken Master" used every trick in his book to make Mayweather work for a victory in the main event of HBO's short-lived "KO Nation" series.