"By far. Not even close, by far the biggest star ever."
Those are words from UFC president Dana White when addressing former women's bantamweight champion Ronda Rousey ahead of her next fight being announced against Amanda Nunes on Dec. 30.
White has stated several times that the UFC has never seen a fighter with more impact in the sport than Rousey, but she has some serious competition from featherweight champion Conor McGregor.
McGregor has pulled in monstrous numbers on pay-per-view for the UFC while also becoming the highest paid fighter in the sport with a reported $40 million earned over the past year.