Atlanta newcomer John Gant was standing at his locker, talking to reporters about his nifty performance when someone stepped up, extended a hand and offered congratulations. “First of many,” said Hall of Fame pitcher Don Sutton, a Braves broadcaster. Gant, the rookie righty with the weird windup, earned his first big league win by beating the team that traded him away last summer, leading the Braves past the New York Mets 5-1 on Friday night.