Ronda Rousey made the fight announcement herself on Good Morning America. Ellen DeGeneres tweeted a UFC 193 promo almost solely featuring Rousey last month. Rousey, it's being billed, is the one attempting to set the UFC's all-time attendance record.
Rousey, the UFC women's bantamweight champion, is undoubtedly the biggest star in the promotion. She's the poster girl, the one doing movies and Carl's Jr. commercials. The one hanging out with Serena Williams and having her words borrowed by Beyonce.
Rousey's prodigious success is the UFC's success. Whenever someone like LeBron James or Kobe Bryant tweets about Rousey, they are tweeting about the UFC.