Arizona Diamondbacks pitcher Zac Gallen left his Friday start in the sixth inning at Seattle with what the team described as right hamstring tightness. Gallen walked the Mariners’ Josh Rojas leading off the sixth, and after Julio Rodriguez fouled off a 1-1 fastball, Diamondbacks manager Torey Lovullo and a member of the team’s training staff came to the mound to check on Gallen, who had thrown 64 pitches.