LAWRENCEVILLE – Stefan Gartrell blasted his team-leading sixth home run in the 10th inning Thursday, sending the Gwinnett Braves to a 5-3 walk-off victory over the Buffalo Bisons at Coolray Field. After failing to hold a two-run lead in the ninth inning, the G-Braves bounced back for their fifth last at-bat win of the season in front of 5,293 fans. Jose Constanza started the 10th-inning rally with a one-out single, then stole second and third base on consecutive pitches from Bisons’ right-hander Fernando Cabrera (L, 2-1).