Kamaru Usman will replace Paulo Costa and fight Khamzat Chimaev in a blockbuster co-main event at UFC 294 in Abu Dhabi on October 21.
UFC: UFC 294: Kamaru Usman takes Paulo Costa's place against Khamzat Chimaev
Kamaru Usman steps in to fight Khamzat Chimzev at UFC 294
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Kamaru Usman vs Khamzat Chimaev Full Fight UFC 294 Abu Dhabi Part 2
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Kamaru Usman to face Khamzat Chimaev at UFC 294 after Paulo Costa withdraws
Kamaru Usman to fight Khamzat Chimaev at UFC 294 in Abu Dhabi after Paulo Costa withdrawal - Eurosport