The UFC is testing a theory that Ronda Rousey's name alone is enough to sell a million or more pay-per-views. Rousey will challenge Amanda Nunes on Friday in the main event of UFC 207 for the women's bantamweight title at the new T-Mobile Arena, after remaining in seclusion not only for virtually all of the buildup to the fight, but ever since she lost her title last year to Holly Holm. Neither Rousey nor Nunes will appear at media day on Wednesday, the only chance for the media to speak to the fighters prior to Friday's show.