The Manny Pacquiao-Jessie Vargas pay-per-view undercard will consist of three world title fights, giving the card four in all, Top Rank chairman Bob Arum said.
Pacquiao, boxing's only eight-division world titleholder, is coming out a brief retirement to challenge Vargas for his welterweight world title in the main event on Nov. 5 (Top Rank PPV, 9 p.m. ET) at the Thomas & Mack Center in Las Vegas, but the rest of the telecast will also include one title fight after another, Arum said.
"We were bound and determined to make this the best overall boxing card of the year, and four world title fights on it with fighters from all over the word does just that," Arum told ESPN.com. "We think boxing is a great sport and it has global ramifications, and we will have fighters from the United States, from Mexico, from China, the Philippines and Japan. I love that. It's like I'm promoting fights in the United Nations."
Arum will host a news conference Tuesday in Los Angeles to formally announce the undercard.
In the co-feature, junior featherweight titlist Nonito Donaire (37-3, 24 KOs), 33, the most famous active Filipino fighter other than Pacquiao, will make his second defense when he takes on mandatory challenger Jessie Magdaleno (23-0, 17 KOs).
"Jessie is a great challenger, a mandatory defense and I know he's hungry because he has been calling me out on social media," said Donaire, the 2012 fighter of the year who has won world titles in four weight classes (five if interim titles are included) from flyweight to featherweight.
Donaire has parted ways with his father, Nonito Donaire Sr., as his trainer for this fight and is working with Ismael Salas, a former Cuban amateur national team trainer.
"I am working great with my new trainer, Ismael Salas. We are learning about each other and he's instructing me about a more precise, compact way of fighting, but still [how to] be very explosive as everyone is going to see on Nov. 5," Donaire said.
Said manager Cameron Dunkin: "[Donaire has] fought the best and beat the best. He's faced many tough challenges. This is a very tough challenge, but this is what Nonito does."
Magdaleno, 24, of Las Vegas, will be facing his most significant opponent but says he is ready for the big time.
"As a kid, I've dreamt of this moment, and the time is finally here," said Magdaleno, younger brother of former lightweight world title challenger Diego Magdaleno. "Nov. 5, I will be victorious with my hands up high."
Frank Espinoza, Magdaleno's manager, has watched Donaire for years and respects him but believes his fighter is ready to knock off the veteran.
"Jessie Magdaleno is very, very motivated for his fight against Nonito Donaire," Espinoza said. "Nonito has been a great champion and has fought in many big fights for a long time. But this is Jessie's time. He has worked hard, and he has what it takes to win and become a world champion."
Said Arum: "I think it's a terrific fight. The managers are really confident, Cameron and Frank. Magdaleno, when he lets his hands go, is terrific, and I love Donaire as a fighter. This is going to be a good one."
Featherweight titlist Oscar Valdez (20-0, 18 KOs), a 25-year-old, two-time Olympian from Mexico, knocked out Matias Adrian Rueda in the second round on July 23 to win a vacant belt and will make his first defense against mandatory challenger Hiroshige Osawa (30-3-4, 19 KOs), 31, of Japan. Hiroshige will be facing the first notable opponent of his 12-year career.
"As a world champion, you have to face tough challenges, and my first defense will be against a tough challenger, but I am ready to face him," Valdez said. "I worked hard to get my belt, and I intend to keep it for a long time."
Espinoza also manages Valdez and expects a similar kind of performance to the explosive one he turned in to win the belt.
"Oscar Valdez won his world championship with a spectacular performance in July, and on Nov. 5, I am sure he will give us another great fight and he will get the win to retain his belt."
The opening bout of the pay-per-view will pit two-time Chinese Olympic gold medalist and three-time world amateur champion Zou Shiming (8-1, 2 KOs) against Thailand's Kwanpichit Onesongchaigym (39-1-2, 24 KOs) for one of the flyweight world titles vacated earlier this month by Juan Francisco Estrada, who is moving up in weight.
Zou, who lost a decision to Thailand's Amnat Ruenroeng in his first world title opportunity in March 2015, already owns a victory against Onesongchaigym. The 35-year-olds met in November 2014 in Macau, China, on the Pacquiao-Chris Algieri undercard, and Zou cruised to a one-sided decision, 120-103, 119-106 and 119-106. But they are the two highest-rated contenders in line for the belt Estrada vacated, so they will meet again. Onesongchaigym has won 12 fights in a row since the loss to Zou.
Zou is enormously popular in China and responsible for big-time boxing in Macau. Arum said Zou brings a lot to the card in terms of sponsorships, ticket sales and Chinese television revenue.
"And I know (casino magnate) Steve Wynn is delighted he is on the card because there will be many high-rollers from China coming in for the fight and staying at (host casino) The Wynn because Zou is fighting for a world title. And if he wins, it means huge fights in 2017 in China and Macau."
In a non-televised undercard bout, but one that the pay-per-view probably will include highlights from, lightweight Robson Conceicao, 27, of Brazil, will make his much-anticipated pro debut in a six-round bout against an opponent to be determined.
Conceicao thrilled the home fans in Rio de Janeiro in August by becoming the first Brazilian boxer to win an Olympic gold medal. A few weeks later, he signed with Top Rank.