Unbeaten Gennady Golovkin knocked out Mexico's Marco Antonio Rubio in two rounds to retain his World Boxing Association middleweight title in California.
The 32-year-old from Kazakhstan, a 2004 Olympic silver medallist, improved to 31-0 with 28 knockouts, the latest coming 79 seconds into the second round and extending a streak of victories inside the distance that began in 2008.
"I loved this fight," said Golovkin, who scored his 18th straight knockout win on Saturday.
"I don't like dancing. I like to fight. This was a true fight. He didn't step back."
Golovkin, defending his world title for a 12th time, landed an uppercut to stun Rubio and finished off the fight with a powerful overhand left.
Rubio tried to rise but referee Jack Reiss counted him out before he made it back onto his feet.
Golovkin could be looking at a unification showdown against the winner of an expected fight between World Boxing Council champion Miguel Cotto and Saul "Canelo" Alvarez.
"I want to fight everybody," Golovkin said.
"I think Cotto next. Next year. Next fight."
Rubio had failed to make weight for the fight, the 34-year-old Mexican tipping the scales 1.8 pounds over the 160-pound (72.57 kg) middleweight limit.
As a result, Rubio was not fighting for the title, but could have dethroned Golovkin and had the title vacated.
Rubio fell to 59-7 with one draw.
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