Early career Gonzaga made his professional
MMA debut on 4 April 2003 in
Santos, Brazil against Cicero Costa, winning via submission due to punches in the first round. He went on to compile a 4-1 professional record with his only loss coming via TKO to
Fabrício Werdum.
Ultimate Fighting Championship He made his UFC debut at
UFC 56, knocking out
Kevin Jordan with a superman punch at 4:39 of the third round. However, weeks before the fight, his pregnant wife started having complications with her pregnancy and lost one of the twins she was carrying. Gonzaga's obligations to his wife during her high risk pregnancy left him unable to train properly. At
UFC 91 Gonzaga knocked out UFC newcomer Josh Hendricks with a right hand at 1:01 of the first round. Gonzaga then faced undefeated heavyweight prospect
Shane Carwin at
UFC 96. In the first 30 seconds of the fight, Gonzaga caught Carwin with an uppercut and two left hooks, breaking his nose. Gonzaga took the fight to the floor, but Carwin quickly fought back to his feet. Against the fence, Carwin pushed Gonzaga away and threw an overhand right that knocked Gonzaga out. The referee called the match at 69 seconds of round one, handing Gonzaga his fourth career loss. At
UFC 102 Gonzaga defeated
Chris Tuchscherer via TKO at 2:27 of the first round. The fight, however, was controversial, as Gonzaga landed an illegal low blow that hurt Tuchsherer very badly. While Tuchsherer was able to continue after taking a full five-minute rest, Gonzaga landed a powerful head kick and continued to dominate the rest of the fight, eventually finishing the fight via strikes. Gonzaga was set to fight
Junior dos Santos at
UFC 108; however, it was reported that he had pulled out of the fight due to a staph infection. The fight between Gonzaga and dos Santos eventually took place on 21 March 2010 at
UFC LIVE: Vera vs. Jones, with Gonzaga losing via knockout in the first round. Gonzaga was defeated by
Brendan Schaub on 23 October 2010 at
UFC 121 by unanimous decision. All three judges scored the fight 30–27 after Gonzaga was out-struck throughout all three rounds by Schaub. This was also the first bout in Gonzaga's professional career to go the distance. Following the loss to Schaub, Gonzaga was released from the promotion.
Post UFC After being released by the UFC, Gonzaga stated that he would only compete in
Brazilian jiu-jitsu but expressed interest in returning to
MMA. Gonzaga returned to action against Reality Fighting Heavyweight Champion
Parker Porter. Gonzaga fought Porter on 8 October where he submitted him with an arm-triangle choke in the third round, winning the Reality Fighting Heavyweight Championship.
Return to the UFC It was announced that Gonzaga signed a new, four-fight contract with the
Ultimate Fighting Championship on 16 December 2011. In his return bout, he faced Ednaldo Oliveira at
UFC 142, replacing an injured
Rob Broughton. Gonzaga won the fight via submission in the first round. Gabriel Gonzaga was expected to face
Shane del Rosario at
UFC 146 on 26 May 2012. Gabriel was pulled from the bout against Shane Del Rosario to replace
Antônio Silva against
Roy Nelson, after Silva was switched to meet
Cain Velasquez. Gonzaga later was forced out of the bout against Roy Nelson because of an injury, being replaced by
Dave Herman. Gonzaga was expected to face promotional newcomer and fellow
Brazilian Geronimo dos Santos on 13 October 2012 at
UFC 153 but dos Santos dropped off the card for an undisclosed reason. As no replacement was scheduled, Gonzaga was also removed from the card. Gonzaga faced
Ben Rothwell on 19 January 2013 at
UFC on FX: Belfort vs. Bisping He won the fight via submission in the second round. Gonzaga lost via first-round knockout to
Travis Browne on 13 April 2013 at
The Ultimate Fighter 17 Finale. Gonzaga faced
Dave Herman on 6 July 2013 at
UFC 162, replacing
Shane del Rosario who had to withdraw from the bout due to an injury. Gonzaga won via KO 17 seconds into the first round. Gonzaga next faced
Shawn Jordan on 19 October 2013 at
UFC 166. He won the fight via knockout at 1:13 of round one. This was Gonzaga's second consecutive first-round knockout. Gonzaga faced
Stipe Miocic on 25 January 2014 at
UFC on Fox 10. He lost the fight via unanimous decision. Post-fight, Gonzaga stated online that he broke his hand in the first round. Gonzaga faced
Matt Mitrione on 13 December 2014 at
UFC on Fox 13. He lost the bout in the first round via TKO. Gonzaga faced returning veteran
Mirko Cro Cop in a rematch on 11 April 2015 at
UFC Fight Night 64. After dominantly winning the first two rounds and being up 20–17 on the scorecards, Gonzaga was finished by TKO in the third round after a surprise flurry of elbows and punches managed to hurt him and turn the fight around in an instant. Gonzaga later stated that he wasn't ready for all 5 rounds, and that he was surprised by Cro Cop's strength and improved elbows. The bout earned both men
Fight of the Night bonus honors. Gonzaga faced Konstantin Erokhin on 11 December 2015 at
The Ultimate Fighter 22 Finale. He won the fight by unanimous decision (30–27, 30–27, and 30–28). Gonzaga was expected to face
Ruslan Magomedov on 10 April 2016 at
UFC Fight Night 86. However, Magomedov was forced out of the bout in early March due to injury and replaced by
Derrick Lewis. Gonzaga lost the fight via KO in the first round. On 30 September 2016 it was announced that Gonzaga would be retiring from the sport unless offered a 6-figure contract from the UFC. ==Professional boxing career==