Early career Phan made his professional mixed martial arts debut against Jason Maxwell in October 2001, and won due to a second-round TKO. He then won his following three fights also, before tasting defeat at the hands of
Rob McCullough in April 2003. In December 2006, and now with a 12–2 record, he made his promotional debut with
Strikeforce against
Josh Thomson at
Strikeforce: Triple Threat. He lost via unanimous decision, however, and was also defeated in his next, and last, Strikeforce fight against
Billy Evangelista at
Strikeforce: Melendez vs. Thomson. He then won the Extreme Fighters World Championships by defeating Shad Smith via TKO at 1:11 of the first round on October 6, 2007. In 2009, he took part in the
Sengoku Raiden Championship's Featherweight Grand Prix where he defeated
Hideki Kadowaki in the opening round. In the second round, at
Sengoku 8, Phan was defeated by
Michihiro Omigawa.
The Ultimate Fighter Phan signed with the
Ultimate Fighting Championship to appear on
The Ultimate Fighter: Team GSP vs. Team Koscheck. On the debut episode, Phan defeated
Mike Budnik via TKO after a liver shot and follow-up punches. Phan therefore earned entrance into the house, where he would be picked for Team Koscheck as Koscheck's fifth pick (ninth overall). In the preliminary fight, Phan fought Spencer Paige, winning via unanimous decision to give Koscheck's team their first win. The first round was closely contested until the final seconds where Phan got a takedown, ground and pounded, and then applied a kimura. In between rounds, Paige told his corner that his left foot was broken. Phan would go on to continue pressuring Paige in the second round to win the fight. For his quarter-final fight, Phan was selected to fight
Cody McKenzie. Phan defeated McKenzie via TKO (punches) in round 2, securing his spot in the semi-finals. In the semi-final round, Phan faced
Michael Johnson. In a back-and-forth fight, Johnson scored takedowns. The consensus at the fight was that Johnson won the opening round, whilst Phan won the second. The third round, however, was argued over, with the coach of each respective fighter believing that their fighter took it. Johnson was declared the winner via split decision.
Ultimate Fighting Championship Phan was expected to face
Alex Caceres on December 4, 2010, at
The Ultimate Fighter: Team GSP vs. Team Koscheck Finale. However, Caceres was forced out of the bout with an injury and replaced by
Leonard Garcia. Phan lost the fight against Garcia via a controversial split decision. Due to the controversy surrounding the decision, both fighters were awarded a win bonus by the UFC and the fight earned
Fight of the Night honors. The loss was named as 2010 Robbery of the Year by many MMA websites, most notably by
Sherdog.com. A rematch with Garcia was expected on March 26, 2011, at
UFC Fight Night 24. However, Phan was forced out of the bout with an injury and was replaced by
Chan Sung Jung. Phan faced
Mike Brown on August 6, 2011, at
UFC 133. He lost the fight via unanimous decision. Phan was expected to face
Matt Grice on October 8, 2011, at
UFC 136, replacing an injured
Josh Grispi. However, Grice was forced out of the bout with an injury with Leonard Garcia stepping in to replace him. Phan won via unanimous decision, also earning both fighters
Fight of the Night bonuses. Phan next faced
Jimy Hettes on December 30, 2011, at
UFC 141. Phan was dominated by Hettes throughout the fight, unable to stop the many takedowns of his opponent and losing via unanimous decision. Phan was briefly linked to a bout with
Zhang Tie Quan on February 26, 2012, at
UFC 144. However, for unknown reasons, the bout never materialized. Phan faced
Cole Miller on August 4, 2012, at
UFC on FOX 4 and won a split decision. Phan faced
Dennis Siver on December 8, 2012, at
UFC on Fox 5, replacing an injured Eddie Yagin. Nam went into the fight with a passive posture, and proceeded to be dominated through the entire three rounds in both stand up and ground games, ultimately losing by unanimous decision. One of the judges scored 10-8 in favor of Siver on all three rounds. Phan fought
Takeya Mizugaki in a Bantamweight bout on December 7, 2013, at
UFC Fight Night 33. He lost the fight via unanimous decision. Phan faced
Vaughan Lee on March 1, 2014, at
The Ultimate Fighter: China Finale. He lost the fight via unanimous decision and was subsequently released from the promotion.
Post-UFC career In his first fight post-UFC, Phan faced Kenichi Ito at Grandslam MMA: Way of the Cage on July 13, 2014. He won the fight via first-round TKO. Phan then faced Yuki Baba at Pancrase 261 on October 5, 2014. Phan won the fight via rear-naked choke submission in the first round.
Bellator MMA On October 17, 2014, it was announced that Phan has signed with Bellator. He made his debut for the promotion against
Mike Richman on November 15, 2014, at
Bellator 131. Phan lost the fight via knockout in the first round.
Retirement On March 12, 2017, after his loss to Whiteford, Phan announced his retirement from MMA competition. == Boxing ==