UFC on Fox 23: Shevchenko vs. Peña

UFC on Fox 23: Shevchenko vs. Peña was a mixed martial arts event promoted by the Ultimate Fighting Championship and held on January 28, 2017, at Pepsi Center in Denver, Colorado. The main event featured 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.