LAS VEGAS – They’re running it back, but for Marcin Tybura , it’s a much more different fight. Saturday, Tybura (25-8 MMA, 12-7 UFC) takes on Serghei Spivac in a rematch that serves as the headlining act of UFC on ESPN 61 which takes place at the UFC Apex. The two heavyweights fought four years ago in Norfolk, Va., where Tybura pulled off a unanimous decision win over the then-25-year-old newcomer. Since, Tybura has seen a lot of improvement in Spivac (16-4 MMA, 7-4 UFC) – enough to almost feel like a different fight. “He for sure (improved),” Tybura said at Wednesday’s UFC on ESPN 61 media day
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