Julio César Chávez Jr. vs. Sergio Martínez was a professional boxing match contested on September 15, 2012, for the WBC and The Ring Middleweight championship.

[1] After winning the middleweight championship against Kelly Pavlik in April 2010, Sergio Martínez made one defence of the WBC belt before he was stripped for not facing "Interim" champion Sebastian Zbik.

[3][4] Martínez trained for the fight in Oxnard, California under his career long time coach, Gabriel Sarmiento.

[6] After the fight, it was revealed that Martínez had broken his left hand (as early as the 4th round) and torn his right meniscus, the latter of which would require surgery.

HBO reported the fight generated 475,000 pay-per-view buys and close to $25 million in revenue.