Vasyl Lomachenko continued his meteoric rise up the boxing ladder, retaining his WBO junior lightweight title Saturday night after challenger Guillermo Rigondeaux quit on his stool after six rounds.
The 29-year-old Lomachenko was awarded the victory when Rigondeaux elected not to come out for the seventh round in the first world title professional showdown between two multiple Olympic gold medal winners.
The outclassed Rigondeaux becomes the fourth straight boxer to quit mid-fight against Ukrainian Lomachenko.
"Maybe I should change my second name, now my name is 'No Mas Chenko'," Lomachenko joked in the ring, referring to Roberto Duran when he threw in the towel against Sugar Ray Leonard in 1980.
Lomachenko improved to 10-1 as he handed the Cuban defector the first loss of his career in front of a crowd of 5,100 at the Madison Square Garden Theater.
Lomachenko humiliated Rigondeaux, using his size and hand speed to dominate every round except the first.
He grew increasingly frustrated with Rigondeaux's tactics which included low blows and more clutching and grabbing than throwing punches. Lomachenko landed 55 punches overall while Rigondeaux landed just 15.
It marked the first time double Olympic gold medal winners battled for a world title as professionals.
Lomachenko, who won gold in the 2008 and 2012 Olympics, has rocketed to the top of his weight class since turning pro in 2013, winning nine world championship fights in his first 11 contests.
Lomachenko lost his second pro fight to veteran Orlando Salido but then won a world title in his next bout by beating Gary Russell. He became a two division champion by moving up in weight in just his seventh fight to beat Roman Martinez.
Rigondeaux, who was booed loudly after the fight, looked the much smaller of the two fighters as the 37-year-old moved up two weight classes to challenge for the title.
A product of Cuba's storied amateur program, Rigondeaux won more than 450 amateur fights and is a two-time Olympic champion, having won gold in 2000 and 2004.
Since turning pro in 2009, his biggest fight before Saturday was a dismantling of Nonito Donaire in 2013.
His last fight, against Moises Flores, was ruled a no contest after he inadvertently landed a fight-ending punch after the bell.