UFC 175 began as a night of upsets, with the first five bouts ending with the underdogs scoring victories.

But in the co-main event, Ronda Rousey proved the oddsmakers right.

Rousey, a -800 betting favorite in some online outlets, needed just 16 seconds to defend her UFC women’s bantamweight title tonight at UFC 175 against Alexis Davis. The knockout win extends her unbeaten career to 10-0.

The decorated judoka Rousey landed a big overhand right, drove her opponent to the mat with a hip throw, and landed a series of punches to the head of Davis. Davis went limp and the referee Yves Levigne stepped in at 0:16 of round one.

Davis, fighting out of San Jose, California but originally of Ontario, Canada, falls to 16-6 in her career. She had entered the Octagon on a five night winning streak.

Rousey, of Santa Monica, California, has defended her title three times since winning the belt last February. She is scheduled for knee surgery but didn’t rule out a return to action next month.

At UFC 175, Ronda Rousey defeated Alexis Davis by knockout at 0:16 of round one.