DALLAS — Stipe Miocic produced another spectacular knockout victory to retain the Ultimate Fighting Championship heavyweight belt on Saturday night, finishing Junior dos Santos in Round 1 of the main event at UFC 211.

Miocic rocked Dos Santos with a big right hand that sent the Brazilian tumbling to the canvas midway through the opening round, then followed up with a punishing flurry before referee Herb Dean ended the contest.

“I’ve been working on that for 10 weeks,” Miocic said, when asked about the punch that altered the course of the fight. “I am the best in the world.”

Sunday will mark a year to the day since Miocic, from Cleveland, claimed the belt by knocking out Fabricio Werdum. That fight ended inside a round, as did his next against Alistair Overeem.

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The big man, with an everyman image supported by his ongoing position as a part-time firefighter in his home city of Cleveland, has become a must-see attraction in the organization, but blink and you will miss his remarkable shows of power and precision.

In late 2014, Miocic suffered his last defeat — to Dos Santos — one of only two career losses. He is greatly improved since then and at 34, shows no sign of slowing down.