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More dominant athlete: Serena Williams or Ronda Rousey?

One has 21 Grand Slam titles and is closing in on another.

The other has demolished every opponent the UFC has sent her way.

Is Serena Williams the most dominant female athlete competing today? Or is Ronda Rousey? You really can't go wrong with either, but Kevin Kaduk and Jay Busbee of Yahoo Sports tackled the topic in their latest "Grandstanding" debate.

Which woman do you think is most dominant? Let us know in the comments below.