Holly Holm
A world boxing champion, Holly Holm put her focus on mixed martial arts.
It all came together for Holm in Melbourne, Australia at UFC 193 on November 15, 2015 against Ronda Rousey.
Holm walked into the Octagon as the challenger, and exited as the UFC female bantamweight champion and one of the top combat sports athletes in history.
She finished Rousey, but would only hold the title for 111 days before losing to Miesha Tate.