LAS VEGAS – Derrick Lewis thinks he’s in the hot seat going into Saturday’s UFC Fight Night 215 headliner. Lewis (26-10 MMA, 17-8 UFC) has suffered back-to-back losses going into this weekend’s heavyweight showdown with Serghei Spivac (15-3 MMA, 6-3 UFC), which takes place at the UFC Apex in Las Vegas. And it’s a radical shift from where he started the year. After bringing a run of five victories in six fights into February’s UFC 271 clash with Tai Tuivasa, Lewis was knocked out
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