Lomachenko retained his WBO title with a TKO win over Rigondeaux

Guillermo Rigondeaux quit before the start of the seventh round of the fight!!!

The 37-year-old former double Olympic champion cited hand and wrist injuries!!!

Vasyl Lomachenko retained his WBO super-featherweight at the New York bout!!!

The Ukrainian retained his WBO super-featherweight title with a sixth round technical knockout of Guillermo Rigondeaux in New York on Saturday, Lomachenko handing the Cuban-born American his first professional defeat.

However, the highly-anticipated duel between a pair of double Olympic champions resulted in an anti-climatic finish. Rigondeaux, citing a hand and wrist injury, told the referee that he did not want to continue prior to the seventh round.

'I guess I should change my name now to NoMaschenko,' Lomachenko said. 

Lomachenko was easily winning boxing's first pro match between two-time Olympic gold medallists when Rigondeaux and his trainers jointly called for the match to be stopped.

Promoter Dino Duva said Rigondeaux first felt pain in the second round and hurt it more significantly in the third. Duva said doctors believed the hand could be broken and were sending the 2000 and 2004 Olympic gold medallist from Cuba to the hospital for X-rays.

Duva said the injury came from a punch – though Rigondeaux certainly didn't hit Lomachenko with many of them.

'Where did he hurt his hand, in the dressing room?' promoter Bob Arum said.

Lomachenko (10-1, 8 KOs) earned his seventh straight victory by stoppage and defended his WBO 130-pound title. And for the fourth straight time, his match ended with his opponent quitting.

Rigondeaux lost for the first time in his 18 pro fights and was loudly booed afterward by a crowd that was supporting both fighters early in the match.

But it was quickly apparent that the 2008 and 2012 gold medallist was too much for the 37-year-old Rigondeaux, the 122-pound champion who was moving up two weight classes for the historic match.

'I adjusted to his style, low blows and all,' Lomachenko said.

Long one of boxing's best defensive fighters, even Rigondeaux couldn't find a way to defend himself against Lomachenko's onslaught.

'It just amazes me what this guy does to an opponent,' Duva said. 'He just frustrates his opponent so bad you don't even know what to do.'

Lomachenko started cautiously but by the third round he had begun finding his way through Rigondeaux's defence.

He was leading 59-54 on two judges' cards and 60-53 on the other, and a fighter who does as little offensively as Rigondeaux was unlikely to make that up even if he could've continued.

'I'm going to come back and fight against anybody because there are no excuses,' Rigondeaux said through a translator.

Rigondeaux would have liked the fight at a lower weight but the height difference may have been a bigger problem. Giving up three inches to the 5ft 7in Lomachenko, he frequently was caught when he tried to lunge forward for shots and couldn't slip Lomachenko's accurate punches, and when he kept trying to duck lower and lower Lomachenko even hit him on top of the head.

It was tense in the fifth round, when Rigondeaux was warned for hitting on the break and they jawed at each other after the bell sounded to end the round. But Lomachenko came back and scored with some solid shots in the sixth, and it became a bigger round for him when Rigondeaux had a point deducted for holding.

Moments later, it was over.

Lomachenko won titles in two weight classes after just seven fights and it may not be long until he has a chance at another, possibly moving up to lightweight next year.