Bob Arum said Julio Cesar Chavez could fight Brian Vera next, and eventually, Andre Ward.
Rios could face British contender Kevin Mitchell on Dec. 10 on Showtime.
Heavyweight Seth Mitchell is seeking a new opponent for Sept. 16.
English heavyweight David Price has ruled out fighting Tyson Fury.
Arce-Vazquez Jr. II might be on Cotto-Margarito card
Tickets for the Andre Ward-Carl Froch fight on Oct. 29 in Atlantic City, N.J., go on sale Friday.
Tavoris Cloud could be on the Bernard Hopkins-Chad Dawson card
Manny Pacquiao supporter Paris Hilton is set to visit him in the Philippines
Arum: Donaire would fight the Mares-Agbeko II winner 'In a heartbeat'
Nonito Donaire will fight in Carson, California on HBO