Darleys Gregorio Pérez Ballesta (born September 14, 1983) is a Colombian professional boxer who held the WBA lightweight title in 2015.

At the 2007 World Amateur Boxing Championships he upset heavy favourite Olexandr Klyuchko (13:10) and knocked out two successive opponents but lost to Kim Song Guk from North Korea {6:23} in the final.

He clinched a berth at the Beijing Olympics in 2008, narrowly losing to eventual gold medallist Aleksei Tishchenko at the quarter-finals stage.

In a competitive yet controversial bout, many thought Crolla had done enough to secure a decision victory but Pérez was fortunate to come away from Manchester with a draw on the cards.

[2] A rematch subsequently followed in Manchester, during which Crolla upset Pérez by knocking him out with a crisp body punch in the 5th round, taking the Colombian's WBA belt in the process.