UFC featherweight champion Sean O'Malley and women's flyweight champion Alexa Grasso are defending their belts Saturday (10 p.m. ET, ESPN+ PPV) at a venue the UFC has never seen before, and may never see again. UFC 306 will be held at Sphere in Las Vegas, where fighters will enter the Octagon surrounded by hundreds of millions of pixels.
The main event will see one of the UFC's most lethal strikers, O'Malley, take on Merab Dvalishvili, currently on a 10-bout win streak. O'Malley captured the featherweight belt against Aljamain Sterling and defended it against Marlon Vera, but it's Dvalishvili that might represent his biggest test before he can be considered one of the UFC's elite fighters.