Conor McGregor's highly anticipated return to the octagon lasted just over a minute on Saturday night.
The former UFC featherweight champion faced Max Holloway in the main event of UFC 329 in Las Vegas.
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McGregor struggled early, falling to the canvas multiple times after attempting kicks.
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He grabbed his right leg in pain following a punch exchange, prompting the referee to stop the fight at 1:09 of the first round.
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UFC broadcaster Megan Olivi described the injury as a "right internal knee injury." Holloway was awarded a technical knockout victory.
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The fight was McGregor's first in five years, following a fractured left leg suffered in a 2021 bout.