Ronda Rousey was the UFC's unstoppable force until Holly Holm used the former champion's aggression against her to produce one of the sport's biggest upsets.
Former UFC middleweight champion Anderson Silva has tested positive for steroid use.
Silva, the 39-year-old Brazilian widely considered the greatest mixed martial artist in the young sport's history, tested positive for Drostanolone metabolites and another steroid in an out-of-competition test Jan...