Scenes from UFC 264 at T-Mobile Arena on Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Conor McGregor, left, fights Dustin Poirier during a UFC 264 lightweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Conor McGregor sits while receiving attention for injury while fighting Dustin Poirier in a UFC 264 lightweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Conor McGregor, left, tries to avoid a punch from Dustin Poirier during a UFC 264 lightweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Conor McGregor yells as he sits on the mat after an injury during his lightweight mixed martial arts bout with Dustin Poirier at UFC 264 on Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Conor McGregor yells as he sits on the mat after an injury during his lightweight mixed martial arts bout with Dustin Poirier at UFC 264 on Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Conor McGregor holds his right ankle while fighting Dustin Poirier during a UFC 264 lightweight mixed martial arts bout Saturday in Las Vegas.

Credit: AP/John Locher

Conor McGregor sits while receiving medical attention for an injury during his lightweight bout against Dustin Poirier at the UFC 264 mixed martial arts event Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Conor McGregor receives attention after suffering an injury while fighting Dustin Poirier in a UFC 264 lightweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Conor McGregor sits on the mat after an injury during his lightweight mixed martial arts bout with Dustin Poirier at UFC 264 on Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Dustin Poirier is declared the winner after Conor McGregor was injured during a UFC 264 lightweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Conor McGregor prepares to fight Dustin Poirier in a UFC 264 lightweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Conor McGregor prepares to fight Dustin Poirier in a UFC 264 lightweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Conor McGregor prepares to fight Dustin Poirier in a UFC 264 lightweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Conor McGregor prepares to fight Dustin Poirier in a UFC 264 lightweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Gilbert Burns celebrates after defeating Stephen Thompson in a UFC 264 welterweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Gilbert Burns, top, pins Stephen Thompson during a UFC 264 welterweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Gilbert Burns, with back to camera, punches Stephen Thompson during a UFC 264 welterweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Gilbert Burns, front, celebrates after defeating Stephen Thompson during a UFC 264 welterweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Gilbert Burns celebrates after defeating Stephen Thompson in a UFC 264 welterweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Greg Hardy, left, is punched by Tai Tuivasa during a UFC 264 heavyweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Yana Kunitskaya, right, kicks Irene Aldana during a UFC 264 women's bantamweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Irene Aldana, top, pins Yana Kunitskaya in a UFC 264 women's bantamweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Irene Aldana, right, punches Yana Kunitskaya during a UFC 264 women's bantamweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Irene Aldana, right, punches Yana Kunitskaya during a UFC 264 women's bantamweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Tai Tuivasa celebrates after defeating Greg Hardy in a UFC 264 heavyweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Tai Tuivasa celebrates after defeating Greg Hardy in a UFC 264 heavyweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Tai Tuivasa, right, punches Greg Hardy during a UFC 264 heavyweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Tai Tuivasa, top, fights Greg Hardy during a UFC 264 heavyweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Tai Tuivasa, top, fights Greg Hardy during a UFC 264 heavyweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: Getty Images/Stacy Revere

Derrick Lewis looks on during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Odell Beckham Jr. looks on during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Dave Chappelle looks on during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: AP/John Locher

Irene Aldana, right, reacts after defeating Yana Kunitskaya in a UFC 264 women's bantamweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Former U.S. President Donald Trump, right, attends UFC 264, Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Gilbert Burns, right, fights Stephen Thompson during a UFC 264 welterweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: Getty Images/Stacy Revere

Ilia Topuria of Germany celebrates after defeating Ryan Hall by TKO in their featherweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Ilia Topuria of Germany (L) fights against Ryan Hall in the first round in their featherweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Ryan Hall (L) attempts a kick against Ilia Topuria of Germany in the first round in their featherweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Ryan Hall (L) and Ilia Topuria of Germany exchange punches in the first round in their featherweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Ryan Hall (R) attempts a kick against Ilia Topuria of Germany in the first round in their featherweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Michel Pereira of Brazil (L) and Niko Price exchange punches during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Michel Pereira of Brazil (L) and Niko Price exchange punches in their welterweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Michel Pereira of Brazil (top) and Niko Price grapple in their welterweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Michel Pereira of Brazil (L) and Niko Price exchange punches in their welterweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Michel Pereira of Brazil (L) and Niko Price grapple during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Niko Price (L) and Michel Pereira of Brazil exchange punches in their welterweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Carlos Condit (L) and Max Griffin exchange punches in the second round in their welterweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Max Griffin (L) and Carlos Condit grapple in the third round in their welterweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Max Griffin celebrates after defeating Carlos Condit in their welterweight bout by unanimous decision during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Max Griffin (L) and Carlos Condit exchange punches in the second round in their welterweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Max Griffin (L) and Carlos Condit grapple in the third round in their welterweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Carlos Condit (R) lands a punch on Max Griffin in the second round in their welterweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Max Griffin (R) lands a punch on Carlos Condit in the first round in their welterweight bout during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: Getty Images/Stacy Revere

Michel Pereira of Brazil (L) and Niko Price exchange punches during UFC 264: Poirier v McGregor 3 at T-Mobile Arena on July 10, 2021 in Las Vegas, Nevada.

Credit: AP/John Locher

Kris Moutinho, right, uses his leg against Sean O'Malley during a UFC 264 bantamweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Sean O'Malley, left, punches Kris Moutinho in a UFC 264 bantamweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Sean O'Malley, right, kicks Kris Moutinho in a UFC 264 bantamweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas.

Credit: AP/John Locher

Sean O'Malley, left, fights Kris Moutinho in a UFC 264 bantamweight mixed martial arts bout Saturday, July 10, 2021, in Las Vegas. 

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