The Ultimate Fighting Championship’s marquee card in Abu Dhabi has suffered its second major change in the past 24 hours.
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After the scheduled main event of UFC 294 fell through on Wednesday when Charles Oliveira withdrew from his scheduled rematch with lightweight champ Islam Makhachev, the co-main event has also undergone a change with Paulo Costa (14-2) not being cleared to compete due to a staph infection on his elbow. In place of “Borrachinha,” former welterweight champion Kamaru Usman (20-3) will step up on 10 days' notice for his middleweight debut against Khamzat Chimaev. UFC CEO Dana White made the official announcement on Instagram.Usman has not competed since UFC 286 in March, when came up short in a bid to win his title back from Leon Edwards. Prior to the back-to-back losses to Edwards, Usman had enjoyed a 15-fight win streak in the promotion including a long reign atop the welterweight division. Meanwhile, the upcoming bout will…