LAS VEGAS — The Sphere, Las Vegas’ transformational new masterpiece, stole the show Saturday night at UFC 306, but Merab Dvalishvili put on a performance not to be forgotten in capturing the bantamweight championship with a unanimous decision over Sean O’Malley. The judges scored it 49-46, 48-47 and 48-47 in favor of Dvalishvili (18-4), a
