Holly Holm KOs Ronda Rousey

The mixed martial arts world has been rocked. How did Superstar Ronda Rousey lose to Holly Holm in the bantamweight championship fight in UFC?

Former world boxing champion Holly Holm (10-0) scored the biggest upset in the sport's history Sunday, knocking out Ronda Rousey (12-1) with a left head kick in the second round to claim the bantamweight championship fight at UFC 193 at Etihad Stadium.

According to ESPN.COM, "The shocking result came 59 seconds into the second round, after Rousey already had been stunned several times by Holm's left hand hits. After Rousey ducked in desperately for a clinch, Holm broke off at an angle and landed a clean left head kick to the jawline that rendered Rousey unconscious. Referee Herb Dean stepped in immediately, as Rousey fell limp, arms extended, to the canvas".

Rousey was taken to a Melbourne hospital after the fight because she suffered a knockout and to treat facial cuts. Rousey reportedly was was "devastated," but OK physically.

She did not have a concussion, but stayed overnight in the hospital.