Spike O'Sullivan has tasted defeat for the fourth time in his illustrious career.
The 35-year-old lost to Jaime Munguia in the early hours of Sunday morning in a middleweight bout.
The Irishman started the fight well, but Munguia took a hold of it the longer it went on and O'Sullivan's corner threw the towel in just before he hit the mat in the eleventh round.
The bout took place at the Alamodome in San Antonio, Texas, with the Mexican remaining undefeated and taking his record to 35-0.
Munguia, who is the current WBO junior middleweight champion, previously defeated Kildare native Dennis Hogan in controversial circumstances.
His most recent win wasn't free from controversy either as O'Sullivan complained about numerous low blows and a shot to the back of the head.
The referee took one point off the 23-year-old for a low blow in the sixth round, but overall he was the much better fighter in his first bout at the weight.
He caught O'Sullivan with numerous body shots throughout and the Cork native struggled with Munguia's jab.
The win could open plenty of doors for the youngster and he stated afterwards that he wants to fight the likes of Canelo, Gennady Golovkin and Jermall Charlo.
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