Kamaru Usman replaces Costa to face Chimaev at UFC 294, Abu Dhabi.

Two top-ranked welterweights clash in a middleweight bout.

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Kamaru Usman, a former champ, seeks redemption after a title loss.

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Khamzat Chimaev, a rising star, aims for future UFC gold.

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Islam Makhachev vs. Alexander Volkanovski for the lightweight title.

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