Juan Manuel López Rivera, often known as Juanma Lopez, is a Puerto Rican former professional boxer who competed from 2005 to 2019. He is a world champion in two weight classes, having held the WBO junior featherweight title from 2008 to 2009, and the WBO featherweight title from 2010 to 2011. As an amateur he represented Puerto Rico at numerous international tournaments, including the 2002 Central American and Caribbean Games, the 2003 Pan American Games, and the 2004 Olympics. López was considered a knockout artist at his peak in the late 2000s and early 2010s.

A knockout is a fight-ending, winning criterion in several full-contact combat sports, such as boxing, kickboxing, muay thai, mixed martial arts, karate, some forms of taekwondo and other sports involving striking, as well as fighting-based video games. A full knockout is considered any legal strike or combination thereof that renders an opponent unable to continue fighting.