For those of you who haven't heard about it already UFC bantamweight champion Ronda Rousey, the most successful female mixed martial arts fighter the world has seen to date, has sustained her first loss in thirteen UFC bouts. It happened last night at a UFC pay-per-view event in Sydney, Australia; she was defending her championship against a relative unknown named Holly Holm and got KO'ed in the second round.

Further details courtesy of the New York Daily News:

 Quote:
MELBOURNE, Australia (AP) — Holly Holm pulled off a stunning upset victory over Ronda Rousey in UFC 193, knocking out the women's bantamweight champion in the second round with a powerful kick to the head Sunday.

The fight started at a frenetic pace with Holm landing some powerful shots to the unbeaten Rousey's head, leaving the frustrated champion with a bloodied nose at the end of the first round.

Rousey attempted to dominate the second round, pushing Holm around the ring until the challenger snapped a massive kick to the head that instantly dropped her opponent to the canvas.

Holm (10-0) jumped on the prone Rousey, delivering several blows to her head before the referee intervened. An ecstatic Holm jumped around the ring as Rousey received medical treatment amid the roar of a stunned record UFC crowd.