Jeff Horn claims upset unanimous decision win over Manny Pacquiao

Horn defeats Pacquiao via controversial decision (2:59)

Jeff Horn and Manny Pacquiao battle for 12 hard rounds, but all three judges see the fight for Horn, a 29-year-old Australian. (2:59)

Jeff Horn has caused one of the biggest upsets in recent boxing history, the Australian defeating Manny Pacquiao on points to win the WBO Welterweight title at Suncorp Stadium in Brisbane.

The judges scored the fight 117-111, 115-113, 115-113 and Horn became the 27th Australian crowned a world champion boxer -- following in the footsteps of the legendary Lionel Rose, Jeff Fenech, Lester Ellis, Johnny Famechon and more recently Anthony Mundine and Danny Green.

Pacquiao had no complaints with the verdict, descibing Horn as "very tough".

"I didn't expect [him to be] that tough," Pacquiao said after the fight as he accepted the verdict.

"It's Ok. Part of the game. That's the decision of the judges. I respect that."

Horn and Pacquiao each said they were willing to fight again in a re-match.

"Bring it on," Horn said.

"Absolutely. No problem," Pacquiao said.

Pacquiao, the eight-division world champion, was the overwhelming pre-fight favourite, as befitting his status as a certain future boxing Hall of Famer, but the Australian showed no respect for reputation or legend as he went on the offensive from the opening bell. Horn landed a flurry, prompting Pacquiao to laugh at him to encourage the Australian further onto the front foot, and the Hornet continued to advance - swarming over the Filipino.

Pacquiao responded in the second round, landing two left hands and cutting the Australian over the right eye in an accidental head-clash, but Horn continued to advance and was soon on the front foot again in the third - landing a big right hand inside a minute before the pair traded heavy blows and the Filipino finished strongly.

Horn threw Pacquiao to the canvas in the fourth round and hit the Filipino with a strong straight right to the forehead, prompting an immediate response from the Filipino before the Australian landed another left hand to the jaw and finished the stronger.

Horn continued to land heavy punches in the fifth round, and Pacquiao slapped his gloves together as he attempted to psych his opponent, but the Australian concentrated only on punching rather than showboating and he rocked the legend again before the Filipino landed his own heavy blows at the death.

Horn opened the sixth strongly, bullying Pacquiao onto the ropes and landing a brutal right uppercut before another accidental head-clash -- Pacquiao claimed a headbutt -- opened a cut above the Filipino's hairline, and the Australian out-worked his rival all the way to the end of the round and landed another heavy right.

Pacquiao started round seven the stronger, and landed heavy blows only to suffer another cut, on the left side of his head in another accidental clash. Horn finished over the top with a flurry of punches that energised the local fans.

Pacquiao started the eighth stronger again, showing a renewed sense of urgency, perhaps feeling the pressure of the situation, and he stung Horn with a right before pushing the Australian to the canvas halfway through the round and ending with a big left to claim the round.

Horn responded in the ninth, getting back on the front foot early, but Pacquiao landed a spate of heavy punches, showing his championship qualities, and the Australian struggled to see out the round.

The referee told Horn he had to show something in the 10th round if he was not to stop the fight, but the Australian stayed alive as Pacquiao was unable to press again in the 10th -- Horn said after the fight that "heart" had got him through the ninth round -- and the fighters drew on their dwindling energy to trade blows in a scrappy 11th.

Horn opened the 12th aggressively, and the pair -- warriors -- traded heavy blows all the way to final bell after which both fighters clearly thought they had won.