UFC 113 was a mixed martial arts event held on May 8, 2010, at the Bell Centre in Montreal, Quebec, Canada. It featured the rematch between Lyoto Machida and Mauricio Rua for the UFC Light Heavyweight Championship. The two first met at UFC 104, where Lyoto Machida retained his belt in a controversial unanimous decision victory. Tim Credeur was scheduled to face Tom Lawlor, but was forced from the card with an injury and replaced by Joe Doerksen.  Joey Beltran was set to fight Chad Corvin, however after Corvin's paperwork was not approved by the Quebec Athletic Commission, Beltran ended up fighting Tim Hague.  Nick Catone was forced out of his bout with John Salter due to a back injury. UFC veteran David Loiseau was supposed to step in as his replacement, but Loiseau was denied a license to appear on this card due to alleged ties to organized crime. Salter ended up fighting returning UFC fighter Jason MacDonald. Loiseau would still make his return to the UFC having faced Mario Miranda at UFC 115. According to UFC President Dana White, the winner of the Josh Koscheck-Paul Daley fight will receive a title shot at Georges St. Pierre for the UFC Welterweight Championship and be the opposing coach to St. Pierre in the upcoming twelfth season of the UFC reality TV show, The Ultimate Fighter.

UFC 113 – Machida vs. Shogun 2 – Preliminary card

• Middleweight bout: Jason MacDonald vs. John Salter
Salter defeated MacDonald via TKO (injury) at 2:42 of round 1.

• Welterweight bout: Yoshiyuki Yoshida vs. Mike Guymon
Guymon defeated Yoshida via unanimous decision (30–27, 30–27, 30–27).

• Heavyweight bout: Tim Hague vs. Joey Beltran
Beltran defeated Hague via unanimous decision (30–27, 30–26, 29–28).

• Welterweight bout: TJ Grant vs. Johny Hendricks
Hendricks defeated Grant via majority decision (29–27, 29–27, 28–28). Grant had a point deducted due to multiple groin strikes.

• Welterweight bout: Marcus Davis vs. Jonathan Goulet
Davis defeated Goulet via TKO (punches) at 1:23 of round 2.

• Middleweight bout: Joe Doerksen vs. Tom Lawlor
Doerksen defeated Lawlor via submission (rear naked choke) at 2:10 of round 2.

UFC 113 – Machida vs. Shogun 2 – Main card

• Middleweight bout: Patrick Côté vs. Alan Belcher
Belcher defeated Cote via submission (rear naked choke) at 3:25 of round 2.

• Heavyweight bout: Kimbo Slice vs. Matt Mitrione
Mitrione defeated Slice via TKO (punches) at 4:24 of round 2.

• Lightweight bout: Sam Stout vs. Jeremy Stephens
Stephens defeated Stout via split decision (30–27, 29–28, 28–29).

• Welterweight bout: Josh Koscheck vs. Paul Daley
Koscheck defeated Daley via unanimous decision (30–27, 30–27, 30–27).

• Light Heavyweight Championship bout: Lyoto Machida (c) vs. Mauricio Rua
Rua defeated Machida via KO (punches) at 3:34 of round 1 to become the new UFC Light Heavyweight Champion.

After the bell sounded to signify the end of the final round, Koscheck walked back to his corner with a visibly upset Paul Daley following. What looked to be a gesture of good sportsmanship turned out to be a sucker punch delivered by Daley which connected. In the post-fight press conference, Koscheck went on to say, "Oh yeah, it hurt. It was the best shot he landed all-night." Dana White stated "He [Daley] will never fight in the UFC again." Dana White confirmed in the post-fight press conference that Kimbo Slice will "probably" be cut from the UFC. When the event was re-aired on cable TV, the Koscheck/Daley fight was not a part of the re-airing, due to Dana White's disdain for the incident which occurred after the final bell.

Fight of the Night: Jeremy Stephens vs. Sam Stout
Knockout of the Night: Mauricio Rua
Submission of the Night: Alan Belcher