MMA Fighting brings you UFC 146 play-by-play and more for the Junior dos Santos vs. Frank Mir fight card. Tonight's event is headlined by a heavyweight title fight between Junior dos Santos and former champion Frank Mir. This bout is scheduled for five, five-minute rounds. Also appearing on the main card is Cain Velasquez vs. Antonio Silva, Roy Nelson vs. Dave Herman, Stipe Miocic vs. Shane del Rosario and Stefan Struve vs. Lavar Johnson. Tonight's fights take place at the MGM Grand in Las Vegas, Nev.