WBC and WBO No.1 middleweight contender Jaime Munguia administered a one-sided beating of a game but outclassed Kamil Szeremeta with the Pole retiring after the sixth-round in their main event at the Don Haskins Center in El Paso on Saturday.

The bout was essentially target practice with the heavy-handed Mexican gradually battering the resistance out of former IBF title challenger Szeremeta, who had stepped in at two weeks’ notice to save the promotion.

After Munguia (37-0, 30 KOs) belaboured Szeremeta (21-2, 5 KOs) to the body and rocked him with an uppercut in a torrid sixth round, the Pole was withdrawn on his stool at the end of the session.

In a huge upset on the undercard, battle-tested veteran Gabe Rosado  (26-13-1, 15 KOs & 1 NC) scored a stunning third round KO of the highly-touted Bektemir Melikuziev (7-1, 6 KOs) in a super-middleweight fracas.

The previously unbeaten Uzbek had been dominating proceedings, having dropped Rosado with a body shot in the opener.

But in the third, an under-fire Rosado timed a right hand to perfection to drop Melikuziev heavily and bring a stunning end to the fight. Rosado could now meet Munguia next.

Earlier, Marlen Esparza (10-1, 1 KO) rose from a first-round knockdown to dethrone WBC flyweight champion Ibeth Zamora (32-7, 12 KOs) on the scorecards. The judges saw a very close bout 97-92, 96-94 and 95-94.