UFC 307 Countdown previews two title fights, as light heavyweight champion  Alex Pereira looks to defend his belt against  Khalil Rountree Jr. and bantamweight queen  Raquel Pennington returns to face the division’s former title holder  Julianna Pena . Pereira will enter the main event flawless in the 205-pound weight class.  He’s successfully defended the belt twice and is widely regarded as on the best strikers on the UFC roster.  Rountree Jr.  brings a five-fight winning streak with him.