Manny Pacquiao vs. Juan Manuel Márquez IV was held on December 8, 2012, at the MGM Grand in Las Vegas, Nevada, billed unofficially as deciding the WBO 'Champion of the Decade' belt. Pacquiao was knocked out with one second left in the sixth round by a right to the jaw, sending him toppling face-first into the canvas.

• Top Rank
• Marquez Boxing Promotions
• Manny Pacquiao
• Juan Manuel Marquez
• Miguel Vázquez
• Mercito Gesta
• Javier Fortuna
• Patrick Hyland
• Yuriorkis Gamboa
• Michael Farenas