Brandon Rios (arm) out of July fight

Former lightweight titlist Brandon Rios suffered a right arm injury and has withdrawn from his July 7 HBO fight, manager Cameron Dunkin said Thursday night.

Rios was scheduled to face Mauricio Herrera in a 10-round junior welterweight bout at the Home Depot Center in Carson, Calif., on a "Boxing After Dark" card headlined by the Nonito Donaire-Jeffrey Mathebula junior featherweight title unification bout.

However, Rios, 26, of Oxnard, Calif., suffered the injury while sparring on Tuesday, forcing him out of the bout.

"He was sparring and he threw a right hand and it got blocked and he heard something pop in his elbow area," Dunkin said.

Rios was forced to move up to the 140-pound junior welterweight division after failing to make the lightweight limit of 135 pounds for two consecutive fights.

In December, he missed weight for a title defense against John Murray and was stripped of the title, although the fight went on the next night with only Murray eligible to win the belt. However, Rios stopped Murray in the 11th round on the Miguel Cotto-Antonio Margarito II undercard at New York's Madison Square Garden and the title remained vacant.

On April 14, Rios (30-0-1, 22 KOs) was supposed to face Richard Abril for the still-vacant belt, but again failed to make weight. The fight went on anyway and Rios won a highly controversial split decision and the title remained vacant because he was ineligible to win it because he had not made weight.

In his last bout, Herrera (18-2, 7 KOs), 32, of Riverside, Calif., lost a competitive 10-round decision in a fight-of-the-year candidate to Mike Alvarado on the Rios-Abril undercard. However, it was such a good fight that he was approved by HBO as an opponent to face Rios.