Photos: UFC 189: McGregor vs. Mendes

Conor McGregor lands a kick against Chad Mendes during their interim featherweight title fight at UFC 189.

Chad Mendes lands a right to the chest of Conor McGregor during their interim featherweight championship bout at UFC 189.

Chad Mendes takes down Conor McGregor during their UFC 189 interim featherweight title bout.

Chad Mendes elbows Conor McGregor as they grapple during their interim featherweight title fight at UFC 189.

Conor McGregor strikes Chad Mendes during their interim featherweight title fight on Saturday night at UFC 189 in Las Vegas.

Conor McGregor gets the best of Chad Mendes against the octagon during their interim featherweight championship bout at UFC 189.

Conor McGregor reacts after stopping Chad Mendes by technical knockout in the second round of their interim featherweight title fight on Saturday night in Las Vegas during UFC 189.

Conor McGregor hoists the flag of Ireland after defeating Chad Mendes for the interim featherweight title on Saturday night at UFC 189 in Las Vegas.

Rory MacDonald connects with a right elbow against Robbie Lawler during their welterweight title fight at UFC 189 on Saturday night in Las Vegas.

Robbie Lawler strikes Rory MacDonald with an overhand left during their welterweight title fight at UFC 189.

Rory MacDonald is checked by the referee after he was stopped by Robbie Lawler via technical knockout in the welterweight championship fight at UFC 189.

Robbie Lawler celebrates after winning the welterweight title by way of technical knockout against Rory MacDonald at UFC 189 in Las Vegas on July 11.

Jeremy Stephens lands a counter punch after Dennis Bermudez missed with a right in their featherweight bout at UFC 189.

Dennis Bermudez lands a right against Jeremy Stephens during their UFC 189 featherweight bout.

Jeremy Stephens strikes with his left hand while Dennis Bermudez attempts a kick during their featherweight fight at UFC 189.

Dennis Bermudez attempts a kick against Jeremy Stephens in their featherweight bout at UFC 189.

Jeremy Stephens celebrates after defeating Dennis Bermudez by technical knockout in the third round of their featherweight fight at UFC 189.

Gunnar Nelson starts to pound Brandon Thatch in the first round of their UFC 189 welterweight bout.

Gunnar Nelson tries to get the upper hand as he grapples with Brandon Thatch during a welterweight fight at UFC 189.

Brandon Thatch gathers himself after losing his welterweight bout by submission to Gunnar Nelson at UFC 189.

Thomas Almeida reacts between rounds of his bantamweight bout against Brad Pickett at UFC 189.

Brad Pickett is knocked out by the left knee of Thomas Almeida in the second round of their UFC 189 bantamweight fight.

Thomas Almeida celebrates after knocking out Brad Pickett in the second round of a bantamweight fight at UFC 189.

Matt Brown strikes Tim Means during a welterweight bout at UFC 189.

Matt Brown, left, and Tim Means grapple during their welterweight fight at UFC 189.

Matt Brown celebrates after defeating Tim Means, who is checked by the referee, by submission in the first round of their welterweight bout at UFC 189.