Available UFC 306 tickets are flying off the virtual shelves as Monday’s presale rolls on – and fans are paying a hefty price just to get in the door. A potential once-in-a-lifetime happening, the UFC is set to debut Sept. 17 at Sphere in Las Vegas for the second “Noche UFC” celebration of Mexican Independence Day. The card features two title fights , as bantamweight champion Sean O’Malley collides with rival Merab Dvalishvili , after women’s flyweight champion Alexa Grasso and former titleholder Valentina Shevchenko fight in a trilogy bout in the co-main event
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