Perennial flyweight contender Ian McCall has withdrawn from his August 4th fight with John Moraga at UFC On Fox IV. No reason has been given thus far on why McCall withdrew from the fight, but the fighter did promise an update in the future. Thus far, no replacement has been named to fight John Moraga, who was making his UFC debut at the event. UFC On Fox IV takes place on August 4th at the Staples Center in Los Angeles, California with Mauricio Rua and Brandon Vera headlining.