Flawed but exciting former junior middleweight champion Jaime Munguia, now campaigning as a middleweight, stopped gutsy “Spike” O’Sullivan in round 11 at The Alamodome in San Antonio, Texas Saturday night.

The fight looked like it might be a short one when Munguia (35-0, 28 KOs) buckled O’Sullivan’s legs with a number of power shots in the opening stanza. Munguia continued his success in rounds two and three, until O’Sullivan timed him perfectly with a hard-right hand.

Munguia boxed for awhile in rounds four and five, but his inclination is to load up and fire away. The crafty O’Sullivan took advantage of this, cracking Munguia with head shots. Munguia lost a point for a low blow in round seven, shaking his head as he walked to his corner.

No matter. His jab strafed O’Sullivan continuously in rounds eight and nine. The stick was hard and accurate. O’Sullivan fought back the best he could, but the accumulation of blows left him wobbly.

Finally, in round 11, O’Sullivan’s corner threw in the towel after their man had been nailed with a number of heavy shots to the chin. O’Sullivan didn’t like it, but it was the correct call.

The time was 2:17 of round 11.

“I want all the best middleweights,” said Munguia “I want Canelo Alvarez, Gennadiy Golovkin, Jermall] Charlo. I want them all.”