UFC on Fox: Holm vs. Shevchenko (also known as UFC on Fox 20) was a mixed martial arts event held on July 23, 2016 at United Center in Chicago, Illinois. The event was headlined by a women's bantamweight bout between former UFC Women's Bantamweight Champion Holly Holm (USA) and multiple-time Muay Thai world champion Valentina Shevchenko (PERU).