Share this: LAS VEGAS — Amanda Nunes defeated Valentina Shevchenko by unanimous decision in a three-round fight last year, but Saturday night’s rematch is the UFC 213 main event, so it’s scheduled to go five rounds. Kenny Florian, a Bostonian UFC fighter-turned-FOX analyst, is intrigued by how that might affect the result at T-Mobile Arena. “For this fight, it being five rounds, it being an Amanda Nunes that had beaten Miesha Tate and Ronda Rousey, I just think she’s a different fighter now,” Florian told NESN.com’s Rachel Holt on Wednesday after a “UFC Tonight” taping at the Park Theater. “Valentina Shevchenko, I think she was gaining a lot of momentum in her first fight against Amanda Nunes, and it had people thinking if