LAWRENCEVILLE — Syracuse right-hander Jeff Mandel threw the second consecutive complete-game shutout against the Triple-A Gwinnett Braves in as many nights, leading the Chiefs to a 7-0 win Sunday at Coolray Field.Mandel’s six hitter, his first nine-inning effort this season, ensured a split of the four-game series. Syracuse left-hander John Lannan threw nine scoreless, three-hit innings on Saturday night, and Mandel (W, 5-5) continued the trend on Sunday, scattering six hits over nine innings while striking out four. He walked none in a 102-pitch, 69-strike outing.