Gomez started boxing age 10 and was managed along the way by his father, an ex-boxer himself.
He fought and lost to Ishe Smith in 2001 and he would later become the roommate of Smith on "The Contender." On the show, he was placed on the West Coast team (as was Smith) and challenged the high-ranked Peter Manfredo Jr. in the first fight. He beat the then undefeated Rhode Islander in a shock fight, although that wasn't the end of Manfredo.
In the quarterfinals, he fought Ahmed Kaddour (who had been bought back in to replace Juan De la Rosa) and beat him easily. The semifinal round saw him up against Manfredo (who had been bought back in to replace Jeff Fraza) again, a fight Manfredo was very keen on. This time round however, the man from Guadalajara lost.
Gomez vs Gatti
Arturo Gatti needed a decent comeback opponent to determine whether he still had anything in the tank after a tough stoppage loss to Carlos Baldomir a year earlier. HBO gave the Gatti team a list of acceptable opponents and the Gatti team picked Gomez for Gatti to come back against, as Gomez was regarded by the Gatti team as a crude brawler type, a light puncher, and slow. The fight was also meant to be a setup fight for Gatti vs Julio César Chávez, Jr. Instead, Gómez defeated the favored Arturo Gatti on July 14, 2007 via 7th round TKO in a dominant effort, landing right hands repeatedly over Gatti's jab and generally getting off first with his own jab and short combinations to Gatti's head and body. Gatti retired following this match.
World Title Shot
Gómez faced lost to Miguel Cotto via 5th round TKO on April 12, 2008 after the ring-side doctor declared him unable to continue after receiving constant punishment from Cotto over the five rounds. Alfonso came into the fight with a still injured right hand (broken in the Tackie fight). Cotto dominated him, landing nearly forty punches a round against him before the ringside doctor stopped the fight prior to the 6th round, though Gomez wanted to continue the fight.
Contestant on the NBC boxing reality television show The Contender.
Gomez was the final opponent of boxing legend Arturo Gatti (Gomez won by TKO in the 7th)
Gomez defeated José Luis Castillo on the Manny Pacquiao vs. Joshua Clottey undercard on March 13, 2010, at the Cowboys Stadium in Texas.
Gomez KO'd Calvin Green on May 21, 2011 on a Fox Deportes card for his comeback fight off the injury to his left elbow.
He's on a 5-fight win streak since losing to Cotto in 2008.
RTD 6 Jose Luis Castillo - 2010
UD 10 Ben Tackie - 2007
TKO 7 Arturo Gatti - 2007
UD 5 Peter Manfredo Jr - 2004
TKO 6 Saul Alvarez- 2011
RTD 5 Miguel Cotto - 2008
UD 7 Peter Manfredo Jr - 2004