8. Holly Holm (0 title defenses as bantamweight champion)
Owner of arguably the biggest upset in UFC history, [autotag]Holly Holm[/autotag] dethroned Ronda Rousey in front of a record crowd at UFC 193 in Melbourne.
Not only did Holm beat Rousey, she dominated her, making her miss repeatedly and punishing her on the counter. She capped off her brilliant performance with a beautifully timed head-kick knockout to shock the world in a massive upset.
A rematch between Holm and Rousey, which the UFC wanted, never materialized. Instead Holm was defeated in her first title defense at UFC 196, where Miesha Tate rallied to submit her in the final minutes of Round 5.
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