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Kayla Harrison is locked in on her UFC 307 opp Ketlen Vieira ... but the 2x Olympic gold medalist tells TMZ Sports she's SO prepared, she's ready to also kick both Julianna Peña and Raquel Pennington's asses, too -- same night!
We caught up with the UFC bantamweight contender this week ... ahead of what'll almost surely be a title eliminator when she squares off with Vieira in Salt Lake City on Saturday night.