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15/11/2015 7:59 PM AEDT | Updated 17/11/2015 3:19 AM AEDT

Ronda Rousey Knocked Out By Holly Holm In 'Unthinkable' UFC Loss

The former undefeated women's bantamweight champion was toppled in the second round.

The "unthinkable" has happened: Former women’s bantamweight champion Ronda Rousey has been defeated.

In what’s been called "the biggest upset" in Ultimate Fighting Championship history, Rousey was knocked out by 34-year-old Holly Holm in the second round of their title bout in Melbourne on Sunday.

Holm, a former world champion boxer from New Mexico, delivered a powerful kick to Rousey’s head 59 seconds into the second round. The blow sent Rousey toppling to the canvas.

According to the Agence France-Presse, the 28-year-old California native, who had been undefeated through 12 UFC fights prior to Sunday's bout, appeared to be "close to unconsciousness as she hit the deck."

Rousey, a former judo Olympian, was reportedly whisked to the hospital following her knockout loss to receive treatment.

MMA Fighting’s Ariel Helwani said that Rousey had a "busted lip," but "no serious injuries." 

"Obviously, she's completely bummed out and depressed," UFC President Dana White told MMA Fighting of the former champ. 

Credit: Quinn Rooney/Getty Images
Credit: Quinn Rooney/Getty Images

Holm, the new bantamweight title holder, now has a 10-0 record in the UFC. 

"I had so much love and support I just thought, 'How can I not do this?'" Holm said from the ring on Sunday, per AP. "This right here is priceless."

Credit: Brandon Magnus/Zuffa LLC via Getty Images

 

Rousey had been a heavy favorite to win on Sunday.

Before the fight, Bovada had her betting odds to win at -2000, "meaning you would [have won] a measly five dollars if you bet $100 on Rousey to win," according to For The Win.

 

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