Ayala signed a three-fight contract with Bellator and made his promotional debut at Bellator 102 in Visalia, California on October 4, 2013, against Thiago dos Santos. Ayala won in an upset, knocking out the Brazilian fighter with a series of punches as the first round ended, causing referee John McCarthy to call off the fight. After the fight, Ayala's contract was updated to six fights and he faced off against Eric Prindle at Bellator 111 on March 7, 2014. Ayala won via TKO due to a doctor stoppage in the third round, after dominating the first two rounds. Ayala faced undefeated Raphael Butler on September 19, 2014, at Bellator 125. He won the fight via submission in the first round. Ayala faced Alex Huddleston at Bellator 139 on June 26, 2015. He lost the fight via submission in the first round. Ayala faced Carl Seumanutafa at Bellator 148 on January 29, 2016. He lost the fight via TKO in the second round. Ayala returned to face Roy Boughton at Bellator 156 on June 17, 2016. He won the fight via TKO in the first round. In his highest profile bout to date, Ayala faced Sergei Kharitonov at Bellator 163 on November 4, 2016. Despite being a significant underdog, Ayala won the fight via knockout just sixteen seconds into the first round. Ayala faced debuting heavyweight Roy Nelson at Bellator 183 on September 23, 2017. He lost the fight by unanimous decision. Ayala faced Cheick Kongo at Bellator 199 on May 12 in San Jose, CA. He lost the fight via knockout in the first round. In his highest profile match to date, Ayala faced former UFC Heavyweight championFrank Mir at Bellator 212 on December 14, 2018. After being taken down and controlled on the ground in the first round, Ayala rallied in the second round to win via TKO after Mir tapped to punches. Ayala was to face former Bellator Heavyweight champion Vitaly Minakov at Bellator 225 on August 24, 2019. However, on the day of the fight, it was announced that Ayala was pulled from the fight by the Connecticut Boxing Commission due to an undisclosed medical reason and was replaced by Tim Johnson. Ayala was re-scheduled to meet Minakov at Bellator 232 on October 26, 2019. However, Minakov was unable to obtain visa for the bout, leading to Ayala being pulled from the card also. Ayala faced Valentin Moldavsky at Bellator 239 on February 21, 2020. After being taken down and dominated on the ground, he lost the fight by unanimous decision.
Personal life
Ayala is married and has two children. He is the cousin of former UFC Bantamweight fighter Joe Soto.
Championships and accomplishments
Bellator MMA
* Tied for most stoppage wins in Bellator heavyweight division history