With three straight stoppage wins in less than a year, the UFC might have a new heavyweight contender on its hands. Serghei Spivac (16-3 MMA, 7-3 UFC) made easy work of two-time title challenger Derrick Lewis (26-11 MMA, 17-9 UFC) with a first-round submission Saturday in the UFC Fight Night 218 main event at the UFC Apex in Las Vegas.
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