Ronda Rousey knocked out by Holly Holm in huge UFC upset br Holly Holm lays into Ronda Rousey during their UFC women's bantamweight championship bout during the UFC 193 event at Etihad Stadium on November 15, 2015 in Melbourne, Australia. br Story highlights br Ronda Rousey loses fight to rival at event in Australia br Kick in second round sent Rousey tumbling br Holly Holm is new world bantamweight champion br (CNN)In possibly the biggest upset in UFC history, Holly Holm has knocked out Ronda Rousey, the woman who claimed to be "the best fighter in the whole world.