Watch HBO Boxing: Donaire vs. Vazquez Jr. and Chavez Jr. vs. Rubio

Live from the Alamodome in San Antonio, Texas, Julio Cesar Chavez Jr. defends his middleweight WBC belt when he takes on fellow Mexican Marco Antonio Rubio and also on the HBO televised broadcast will be a co-feature of the evening a super-bantamweight title fight between two younger explosive punchers Nonito Donaire and Wilfredo Vazquez Jr. for the vacant WBO belt.

Undefeated Mexican boxer Julio Cesar Chavez Jr. (41-0-1, 31 KO
s) will face what many boxing pundits believe is his toughest test yet, in the veteran Marco Antonio Rubio (53-5-1, 46 KOs) on Saturday night, and Chavez knows that beating Rubio is the right path to be taken seriously as a champion. Chavez Jr. is trained by the legendary boxing trainer Freddie Roach who is best known for his work with Manny Pacquiao.

Nonito Donaire (27-1, 18 KOs) is looking to follow the footsteps of his famous countryman Manny Pacquiao and rise up a few weight divisions, winning world titles in impressive fashion. Having already conquered other lower weight divisions, Donaire is making his 122-pound debut for a world title against the tough Wilfredo Vazquez Jr. of Puerto Rico. Wilfredo Vazquez Jr. (21-1-1, 18 KOs) is a former WBO champion with heavy hands, this will be a good opponent to see whether Nonito Donaire has what it takes to make a run against the top 122-pounders in the world.

Watch HBO World Championship Boxing: Julio Cesar Chavez Jr. vs. Marco Antonio Rubio and Nonito Donaire vs. Wilfredo Vazquez Jr. Live on Saturday 10:00 PM ET/7:00 PM PT on HBO.