Last week, a previously agreed-upon UFC on ESPN 3 headliner between Paulo Costa and Yoel Romero gave way to a rematch between Romero and Ronaldo “Jacare” Souza. ESPN.com was first to announce the news with a confirmation from UFC President Dana White, but no reason was given for the switch.
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Yoel Romero says he heard USADA violation for Paulo Costa, then walks it back – MMA Junkie