Bocek is one of Canada's first Brazilian Jiu-Jitsu black belts and has been studying the art for more than a decade. He first studied under Rickson and Renzo Gracie and then moved on to Nova Uniao where he received his black belt through Joao Roque in 2003 of December. Bocek currently trains BJJ with Marcelo Garcia.

Bocek caught the attention of the UFC when president Dana White and fellow owner Lorenzo Fertitta began training Brazilian Jiu-Jitsu under his tutelage.

In his UFC debut at UFC 73, Bocek lost to future UFC Lightweight Champion Frankie Edgar via first round TKO.

After rebounding at UFC 79 with a decision win over Doug Evans, Bocek lost to TUF winner Mac Danzig by submission in the third round.

He fought against Alvin Robinson at UFC 91 on November 16, 2008 and won by submission. His next fight was against David Bielkheden at UFC 97, where he dominated Bielkheden and submitted him by rear naked choke in the first round.

He was expected to face Matt Veach on December 5, 2009 at The Ultimate Fighter 10 Finale until Veach stepped up to fight Frank Edgar as Kurt Pellegrino's replacement. Bocek then fought UFC newcomer Joe Brammer on the same card. He defeated Brammer via first round submission.

Bocek lost a close fought decision to Jim Miller on March 27, 2010 at UFC 111, despite controlling Miller's position throughout most of the contest.

Bocek defeated Dustin Hazelett via first round submission on December 11, 2010 at UFC 124.

Bocek faced former WEC Lightweight Champion Benson Henderson on April 30, 2011 at UFC 129. He lost the fight via unanimous decision.

Bocek faced Nik Lentz on December 10, 2011 at UFC 140. He won the fight via unanimous decision after taking down Lentz all three rounds and controlling him.

Bocek was expected to face Matt Wiman on April 21, 2012 at UFC 145. However, Wiman was forced from the bout with an injury and was replaced by returning UFC veteran John Alessio. He won via unanimous decision (30-27, 29-28, 30-27).