Juan Manuel Márquez vs. Michael Katsidis was a professional boxing match contested on November 27, 2010, for the WBA, WBO, and The Ring lightweight championship.

Lightweight champion Juan Manuel Marquez agreed to fight Michael Katsidis at the MGM Grand Garden Arena on the Las Vegas Strip on November 27.

Marquez (51–5–1, 37 KOs) had decisively won a rematch with Juan Diaz on July 31 in his first fight since losing to Floyd Mayweather Jr. in their 2009 bout.

[1][2] After failing to interest Manny Pacquiao in a third fight, Marquez agreed to a mandatory title defense against Michael Katsidis (27–2, 22 KOs), who had revitalized his career with four straight victories following back-to-back losses to Joel Casamayor and Juan Diaz.

[11] Marquez had slowed to the point that he almost seemed to prefer getting into slugfests where he could still use his excellent counter-punching accuracy, while Katsidis had never been one to turn down a blood-drenched war.