LAWRENCEVILLE – After frigid temperatures and rain forced a postponement of Opening Day on Thursday, the forecast could not have been better for the Gwinnett Braves to start the 2013 season on Friday. In front of a Coolray Field crowd of 6,272, the G-Braves rode a strong pitching performance by Sean Gilmartin to a 5-4 win over the Charlotte Knights. Gilmartin had a solid season debut, yielding just a run on six hits over five innings.