Former schoolteacher Jeff Horn stunned world champion Manny Pacquiao to win the World Boxing Organisation welterweight crown with a unanimous points decision in Brisbane on Sunday.

Given no chance by most observers, the 29-year-old Horn’s ultra-aggressive style proved too much for Pacquiao, with the three judges scoring the fight 117-111, 115-113 and 115-113 to the Australian after 12 rounds.

Pacquiao, 38, is an eight-weight world champion considered one of the greatest fighters of his generation. His camp had predicted a “short and sweet” win over Horn, a 2012 Australian Olympian.

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But Horn showed no signs of being overawed by the occasion, taking the fight to the Filipino great from the opening bell. He moved forward relentlessly, not allowing Pacquiao time to find any rhythm.

Pacquiao did manage to land some left jabs in the opening rounds to take the early points, but Horn refused to back away and his brawling tactics paid dividends through the middle stages.

Pacquiao, bleeding profusely from cuts to the head high above both eyes, then launched a savage counterattack in the ninth round and appeared to have Horn in trouble, only for the Australian to come back and win the 10th as he reasserted control.

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Both fighters began to tire in the final two rounds but Horn’s early lead proved too much to peg back as he claimed the biggest win of his career.

Pacquiao had been hoping to set up a second big-money showdown with Floyd Mayweather, but it was Horn who called for a fight with the unbeaten American immediately after his win.