MELBOURNE, Australia — Former boxing champion 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.

Rousey was unbeaten through 12 UFC fights before meeting Holm, and a win would have been her seventh title defense. Instead, a veteran female boxer from New Mexico has the championship belt.