UFC on Fox 23: Shevchenko vs. Peña was a mixed martial arts event promoted by the Ultimate Fighting Championship held on January 28, 2017 at Pepsi Center in Denver, Colorado. A potential UFC Women's Bantamweight Championship title eliminator between multiple-time muay thai world champion Valentina Shevchenko and The Ultimate Fighter: Team Rousey vs. Team Tate bantamweight winner Julianna Peña served as the event headliner.

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Main Cast: Valentina Shevchenko, Julianna Peña, Jorge Masvidal, Donald Cerrone, Francis Ngannou, Andrei Arlovski, Jason Knight, Alex Caceres, Sam Alvey, Nate Marquardt

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