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Anthony Mundine has won the vacant WBA International super welterweight title with a sixth-round TKO over Shane Mosley at Allphones Arena.

The American star suffered a back spasm and the fight was called off by refreeze Raul Caiz Sr following a recommendation from doctor Lou Lewis.

Mundine was leading 58-56 on two cards and 60-55 on the third.

I just want to fight the best fighters…I just want to mix it with them.

Despite the less than ideal finish, it was one of the best performances of Mundine’s 13-year professional career.

It dropped Mosley’s record to 47-9-1, the 42-year-old saying he would decide after he returned to the US whether he would retire.

Mundine improved to 45-5, with his management team now hopeful the win could give the 10th-ranked WBA contender a fight against Floyd Mayweather.

It was the first time in his professional career spanning 20 years and almost 60 fights Mosley had been stopped.

“I felt I was behind, I felt Mundine was outpointing me but felt I was still a puncher’s chance … I just couldn’t move,” Mosley said.

Mundine said his heart went out to Mosley.

“I know he’s a warrior, one of the best fighters to ever live. Not someone to punk out for something stupid, obviously back spasms got him,” Mundine said.

“I just want to fight the best fighters…I just want to mix it with them.”

In the main support bout, rugby league star Blake Ferguson was outpointed in a four-round heavyweight contest by fellow boxing debutant Luke Turner.

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— AAP