TORONTO – Joanna Jedrzejczyk ’s often-used mental warfare tactics have been largely absent ahead of UFC 231. However, that doesn’t come as any surprise to opponent Valentina Shevchenko . Shevchenko (15-3 MMA, 4-2 UFC) meets Jedrzejczyk (15-2 MMA, 9-2 UFC) on Saturday in a matchup that will determine who wins the vacant women’s flyweight championship
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