Career
He is best known for his victory at the 2007 Pan American games in the super heavyweight division. Alfonso beat Newfel Ouatah but lost to Russian Evgeny Romanov at the world junior championships 2004 (semifinal). He was also defeated nationally by compatriot superstar Odlanier Solis twice in 2004 at 201 lbs and later went up to super heavy.
He became the Cuban #1 only after Solis (who had gone up in weight, too) defected and he beat veteran Michel López Núñez in the National Championships 2007 and 2008.
He qualified for the 2008 Olympics by beating young American Michael Hunter junior in the final of their qualifier 9:1. He lost his first Olympic bout 3:5 to Ukrainian Vyacheslav Glazkov.