He signed a multi-fight deal with Golden Boy Promotions in early 2013,[1] and challenged for the WBC lightweight title in 2014.
Belmontes made his pro debut against fellow 19-year-old Olvin Mejia in Brownsville, Texas, on January 18, 2008, winning by way of unanimous decision.
He faced Francisco Vargas for his NABF and WBO Inter-continental Super featherweight titles, and lost via unanimous decision on December 13, 2013, at the Fantasy Springs Casino in Indio, California.
[6] In his next bout, he upset previously undefeated Will Tomlinson, a former IBO Super featherweight champion, by way of unanimous decision on March 8, 2014, on the Saúl Álvarez vs. Alfredo Angulo undercard at the MGM Grand in Las Vegas.
[7] On April 26, he fought Omar Figueroa for his WBC lightweight title in the opening bout of a Showtime tripleheader at the StubHub Center in Carson, California.