Ronda RouseyIt's no secret just how good Ronda Rousey is.

The UFC women's bantamweight champion is 12-0 all-time and 6-0 in the UFC. Rousey has spent just 7:57 in the Octagon, with only two of her fights lasting longer than a minute.

Holly Holm will have a tough task ahead of her when she takes on Rousey in UFC 193 on Sunday in Melbourne, Australia. Rousey has shown complete dominance in all of her fights, taking her opponents down with lightning speed, and she'll be looking to do the same to Holm.

Holm might want to look back at some of Rousey's best fights, including quick takedowns of Miesha Tate and Cat Zingano.

Click for Ronda Rousey's top five fights>>

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Photo via Jayne Kamin-Oncea/USA TODAY Sports Images