California kid

Faber made his professional MMA debut as part of the Gladiator Challenge promotion on November 12, 2003, defeating Jay Valencia by Aguinaldo choke  at 1:22 of round 1. Faber then defeated George Adkins by TKO (strikes) on February 12, 2004, earning a shot at GC Bantamweight champion, David Velasquez. On June 6, 2004, Faber defeated Velasquez by unanimous decision, becoming the new GC Bantamweight champion. In his first title defense, Faber defeated Del Hawkins by TKO(strikes) at 3:19 of the first round on August 19, 2004. After this fight, Faber began to take fights in both GC and King of the cage, GC's parent promotion.

Upon moving to KOTC, Faber defeated Rami Boukai by majority decision on September 24, 2004, barely a month after his last fight. On November 14, 2004, Faber defeated Eben Kaneshiro by submission (strikes) to win the KOTC Bantamweight championship, co-holding it with the GC Bantamweight title.

On March 13, 2005, Faber made his return to GC, defeating David Granados by rear naked choke at 2:13 of round 1. On May 7, 2005, he defended his KOTC belt for the first time, defeating Hiroyuki Abe by TKO (cut) at 2:37 of the third round. Returning to GC on September 10, 2005, Faber had his first defeat, losing the GC Bantamweight championship to Tyson Griffin by TKO (strikes) at :05 seconds of round 3.

On October 29, 2005, Faber defended his KOTC title again, defeating Shawn Bias by guillotine choke at 1:24 of the first round. He returned to GC on December 11, 2005, defeating Charles Bennittt by rear naked choke at 4:38 of round 1. Faber then fought at a TKO Major league mma event on January 8, 2006, facing Ivan Menijivan. Faber won by disqualification at 2:02 of the second round when Menjivar landed an illegal kick to a downed Faber.