After compiling an amateur record of 5-1 with one no contest, Spencer began his professional career in 2009. Until 2011, he fought mainly for such Texas-based promotions as King of Kombat and Supreme Warrior Championship. With a record of seven wins and one loss, he signed with Bellator.
Spencer was expected to face Hayward Charles on August 17, 2012 at Legacy FC 13. However, due to undisclosed reasons, Spencer was rescheduled to face Evan Cutts in the same event. He defeated Cutts via unanimous decision. Spencer was scheduled to face Roy Spoon on April 12, 2013 at Legacy FC 19 but it was announced in January 2013 that he had in fact signed with the UFC to replace an injured Magnus Cedenblad against Rafael Natal.
Ultimate Fighting Championship
Spencer made his promotional debut on short notice against Rafael Natal on January 26, 2013 at. He was defeated via submission due to arm-triangle choke in the third round. In his second fight in the promotion, Spencer moved down to the welterweight division and faced Yuri Villefort on September 4, 2013 at UFC Fight Night 28. He won the fight via split decision. Spencer was called to replace an injured Zak Cummings against Sérgio Moraes on November 30, 2013 at. However, Moraes also got injured and Spencer instead faced promotional newcomer Drew Dober. He won the fight via unanimous decision. Spencer next faced Alex Garcia on March 15, 2014 at UFC 171. He lost the back-and-forth fight via split decision. Spencer was expected to face Luiz Dutra on June 28, 2014 at but the bout was scrapped due to an injury from Dutra. Spencer faced Paulo Thiago on September 13, 2014 at UFC Fight Night 51, replacing an injured Joe Riggs. Spencer won the fight via unanimous decision. Spencer faced Cathal Pendred on January 18, 2015 at UFC Fight Night 59. Spencer lost the fight by a controversial unanimous decision. Both Joe Rogan and Mike Goldberg had felt Spencer had dominated the fight and declared on air how baffling the decision was; later UFC president Dana White echoed this sentiment on air. Likewise, all 15 major MMA media outlets scored the fight in favor of Spencer. Spencer was expected to face Mike Pyle on May 23, 2015 at UFC 187, but an injury forced Spencer out of the bout, and he was replaced by Colby Covington. The bout with Pyle was rescheduled and eventually took place on February 6, 2016 at UFC Fight Night 82. Spencer lost the back-and-forth fight via TKO in the third round. Both participants were awarded Fight of the Night for their performance. Spencer next faced Yancy Medeiros on September 10, 2016 at UFC 203. He lost the fight via submission in the second round.
Return to LFA
After being released from the UFC, Spencer returned to Legacy Fighting Alliance. Spencer fought Bilal Williams at and lost via TKO in the second round.
