Early career Robertson compiled a 10–0 professional MMA record before signing with the UFC including a submission win over TUF alum
John Kolosci at
Bellator XXV.
Ultimate Fighting Championship Robertson was expected to make his UFC debut against fellow unbeaten fighter,
Pascal Krauss on November 13, 2010, at
UFC 122. However, Robertson was forced out of the bout with an injury and replaced by Mark Scanlon. Robertson eventually made his UFC debut on February 5, 2011, at
UFC 126, losing to
Mike Pierce via TKO in the second round. Following the loss, Robertson was released from the promotion.
Post-UFC Robertson had his first post-UFC fight against fellow UFC veteran Lúcio Linhares on October 1, 2011. He won via KO due to a spinning backfist in round 1.
Return to UFC Robertson made his UFC return against
Aaron Simpson on July 11, 2012, at
UFC on Fuel TV: Munoz vs. Weidman, replacing an injured
Jon Fitch. He lost the fight via unanimous decision (30-27, 29-28, 29-28). Robertson defeated Brock Jardine on February 23, 2013, at
UFC 157. He was victorious in the first round due to a modified kneebar from the back mount position. The submission applies pressure to the hamstring of the opponent by grabbing the ankle and hyperextending at the knee. The finish earned him the
Submission of the Night bonus. Robertson faced
Sean Pierson on June 15, 2013, at
UFC 161. Pierson defeated Robertson via majority decision. Robertson was expected to face Joao Zeferino on September 4, 2013, at
UFC Fight Night 28. However, Robertson pulled out of the bout citing and injury and was replaced by UFC newcomer Elias Silverio. Robertson faced
Thiago Perpétuo on March 23, 2014, at
UFC Fight Night 38. He won the fight via submission in the first round. Robertson was briefly linked to a bout with
Zak Cummings on July 16, 2014, at
UFC Fight Night 45. However, Cummings was pulled from that fight in favor of a matchup with
Gunnar Nelson a few days later at
UFC Fight Night 46 after his opponent
Ryan LaFlare was removed from the card. Subsequently, Robertson eventually faced
Ildemar Alcântara on July 5, 2014, at
UFC 175. He won the fight via unanimous decision. Robertson faced
Sultan Aliev on January 24, 2015, at
UFC on Fox 14. He won the fight via knockout in the first round. The win also earned Robertson his first
Performance of the Night bonus award. Robertson was expected to face
George Sullivan on April 18, 2015, at
UFC on Fox 15. However, Robertson pulled out of the bout citing injury and was replaced by
Tim Means. Robertson next faced
Ben Saunders on July 25, 2015, at
UFC on Fox 16. He lost the back-and-forth fight by split decision. Robertson faced
Roan Carneiro on September 17, 2016, at
UFC Fight Night 94. He lost the fight via split decision and was subsequently released from the promotion.
Post-UFC career After over four years away from competition, Robertson is scheduled to challenge Dante Schiro for the Caged Aggression Welterweight Championship at Caged Aggression 30 on March 27, 2021. Robertson faced
Chris Curtis on July 30, 2021, at XMMA 2. He lost the bout via unanimous decision. ==Personal life==