Ronaldo Souza dos Santos, born on December 7, 1979, nicknamed Jacaré , is a Brazilian mixed martial artist, submission grappler and Brazilian jiu-jitsu practitioner competing in the UFC’s middleweight division. A highly regarded grappler on the world stage, Souza is also the former Strikeforce Middleweight Champion, and has also formerly competed for DREAM, and Jungle Fight. As of January 27, 2018, he is #3 in official UFC middleweight rankings.
Souza made his mixed martial arts debut on September 9, 2003 at Jungle Fight’s inaugural event where he lost to Jorge “Macaco” Patino by KO at 3:13 into the first round. He returned to mixed martial arts eight months later at Jungle Fight 2 securing a submission win over Victor Babkir under a minute into the first round. His next fight was in April 2006 at Jungle Fight 6 where he got his second win, defeating Alexander Shlemenko by an arm triangle choke submission. He went on to fight twice before the end of 2006, winning both fights by submission during the first round.
In 2008, Souza signed with Japanese MMA-promotion DREAM and was scheduled to participate in the 2008 DREAM Middleweight Grand-Prix. In the first round of the tournament, at DREAM 2 on April 29, 2008, he defeated Ian Murphy by a rear-naked choke submission in the first round. This secured him a place in the quarter-finals which took place at DREAM 4 on June 15 where he fought former ICON Sport Middleweight Champion Jason “Mayhem” Miller. The fight went the distance with Souza continuously going for submissions with Miller escaping multiple rear-naked choke, leglock and armbar-attempts while mounting his own offense on the feet. Souza was awarded a unanimous decision victory which secured him a place in the semi-final of the Middleweight Grand-Prix.
In the semi-finals which took place at DREAM 6 in September , Souza defeated Zelg Galesic early in the first round by armbar submission. The victory earned him a place in the finals of the tournament and a shot at the DREAM Middleweight Championship against Gegard Mousasi that same night. In the fight Souza was knocked out early in the first round by an upkick as he attempted to dive past Mousasi’s guard to land a strike of his own.
Souza fought in the DREAM Middleweight Championship in a rematch with Jason Miller at DREAM 9 after Gegard Mousasi vacated the title when moving up to Light Heavyweight. The fight was called a no contest due to an illegal kick to the head that opened up a gash on Souza’s head.
Souza fought Tim Kennedy in August 2010 at Strikeforce: Houston for the vacant Strikeforce Middleweight Championship, and won via unanimous decision. He then defended the belt for the first time against Robbie Lawler, in January 2011 at Strikeforce: Diaz vs. Cyborg.
In March, 2012, Souza made his sixth Strikeforce appearance against late replacement Bristol Marunde and won via arm-triangle choke, submitting Marunde at 2:43 of the final round.
He next fought faced UFC veteran Ed Herman at the final Strikeforce card, Strikeforce: Marquardt vs. Saffiedine, in January 2013 and won via submission in the first round.
He next knocked out Yushin Okami in the first round in September 2013, at UFC Fight Night 28.
Souza beat Francis Carmont by unanimous decision in February 2014, at UFC Fight Night 36.
He faced Gegard Mousasi in September 2014, at UFC Fight Night 50 and won via submission in the third round, earning his first Performance of the Night bonus award.
Souza faced Vitor Belfort in May 2016 at UFC 198 and won the fight via TKO in the first round and was awarded a Performance of the Night bonus.
Souza fought Robert Whittaker in April 2017 at UFC on Fox 24 and lost by second-round TKO.
A rematch with Derek Brunson took place on January 27, 2018 in the main event at UFC on Fox 27. Souza won the fight via TKO in the first round; making his professional record of 25 wins and 5 losses.
Souza is scheduled to face Kelvin Gastelum on May 12, 2018 at UFC 224.