Elite XC (2007–2008)
Slice fought Bo Cantrell, 10–9, at EliteXC: Renegade. He was originally set to make his professional MMA debut against Mike Bourke, a reformed street fighter, but a shoulder injury from Bourke led him to face Bo Cantrell. Slice defeated Cantrell 19 seconds into the first round by submission due to strikes, landing a variety of elbows and body punches, after Cantrell failed to land a spinning back fist.
On February 16, 2008, Slice fought Tank Abbott in the main event at EliteXC: Street Certified. He won by KO 43 seconds into the first round due to strikes, taking his pro record to 2–0. At the fight, his weight was announced at an all-time low of 234 lb (106 kg), a far cry from his street fighting days of 280 lb (130 kg). During his ensuing three fights, Slice did not utilize full skills in MMA and relied heavily on striking, punches and elbows, and modified Muay Thai.
On May 31, 2008, Slice fought in the main event of the first ever mixed martial arts event shown on prime time network television, EliteXC: Primetime. Though one of the judges had each fighter winning one of the first two rounds, Slice's opponent James Thompson won both on total points by repeatedly taking down Slice and grounding and pounding. In the opening seconds of the third round, however, Slice threw a haymaker to Thompson's left ear, which ruptured Thompson's cauliflower. This was soon followed by three unanswered punches to a standing Thompson, which led to a referee stoppage and the controversial win for Slice. Fellow EliteXC competitor Brett Rogers, who himself had previously defeated Thompson in a previous Elite XC event, was particularly critical of Slice's victory, calling Slice's performance "garbage" in a post fight interview. Frank Mir was also a critic of Slice, stating in an interview that "every time Kimbo Slice fights, it sets (mixed martial arts) back".
On October 4, 2008, a Kimbo Slice vs. Ken Shamrock fight was supposed to take place at the BankAtlantic Center in Sunrise, Florida as part of CBS' Saturday Night Fights. However, Shamrock received a cut to the left eye during a warm-up only hours before the fight was to take place. This left the head of fight operations, Jeremy Lappen, to choose a replacement for the fight. Options were Seth Petruzelli, Aaron Rosa and Frank Shamrock. Slice's team stated they did not want him fighting Frank no matter how much money was offered to them, so Lappen decided that Petruzelli was the best option for the main event. Slice agreed to take the fight after receiving a raise in pay, and took in $500,000. Petruzelli defeated Slice by TKO 14 seconds into the first round of the bout.
Interviewed on Orlando radio show The Monsters in the Morning two days after the fight, Seth Petruzelli said that when they offered him a spot in the main event, EliteXC promoters added monetary incentives to dissuade him from using certain fighting techniques against Slice, in an attempt to protect their relatively unproven Internet star.
The promoters kinda hinted to me and they gave me the money to stand and throw with him, they didn't want me to take him down. Let's just put it that way. It was worth my while to try and stand up punch him.
This added to the controversy surrounding the representation of Slice as a top flight martial artist by CBS and EliteXC. The Florida Department of Business and Professional Regulation started a preliminary investigation on the events surrounding the fight and its outcome.
However, Petruzelli retracted this statement a few hours later, claiming in a follow-up interview with MMA website FiveOuncesofPain.com that his previous comments on The Monsters had been misinterpreted.
What was meant to be said was that I wanted to keep the fight standing for myself because I knew that was what the crowd, the promoters, and everyone wanted to see because that's more exciting than just taking someone to the ground. That was my thing only. I wanted to keep it exciting so I decided to keep it standing. It had nothing to do with anybody else. That was all me.
On October 23, 2008, the Florida Department of Business and Professional Regulation concluded its investigation of the bout and found no wrongdoing. By the end of October 2008, EliteXC was forced to file for bankruptcy. Many in the mixed martial arts community, including Jay Thompson, executive consultant to the company, attributed EliteXC and ProElite's failure due to Slice's loss to Seth Petruzelli.
