Juan Manuel Márquez vs. Manny Pacquiao II

Juan Manuel Márquez vs. Manny Pacquiao II, billed as Unfinished Business, was a junior-lightweight title boxing match. The bout took place on March 15, 2008 at the Mandalay Bay, Las Vegas, Nevada, United States and was distributed by HBO PPV. The fight is second of the Pacquiao-Márquez tetralogy.

Pacquiao defeated Márquez via split decision, knocking down Márquez once in the third round. Two of the judges scored 115-112 and 114-113 for Pacquiao, while the third judge scored 115-112 in favor of Márquez. After the fight, Pacquiao admittedly considered this fight as his most difficult fight since their first match in 2004.

With the victory, Pacquiao became the first Asian boxer to win world titles in four different weight classes.