Manny Pacquiao vs. Jeff Horn, billed as the Battle of Brisbane, was a boxing match for the WBO welterweight championship.

Horn won the fight by highly controversial unanimous decision and claimed his first world title in boxing.

[8] In front of 51,052, Pacquiao lost a hard fought fight via controversial unanimous decision when the three judges scored it 117–111, 115–113, 115–113 in favor of Horn.

[9] Although Horn was the aggressor and showed determination throughout the fight, it nearly came to an end in round 9 when Pacquiao took control and looked for the stoppage.

Horn lasted the round and was told by referee Mark Nelson to show competitiveness or else he would stop the fight.

[24] The event was a prelude to a long-term deal between ESPN and Top Rank, formally announced in August and replacing its former agreement with HBO (which discontinued boxing telecasts).

[35] Dieter Kurtenbach of Fox Sports described the fight as "rigged", and T. J. Quinn of ESPN commented, “No way in hell Horn won unanimously,” he tweeted.

[37] In August 2017, boxing promoter Bob Arum scheduled a rematch between Pacquiao and Horn in Brisbane that was likely to be set for November 2017.

In response to a request from the Philippines Games and Amusements Board, the WBO agreed to rescore the fight between Pacquiao and Horn.