Arizona Diamondbacks ace Zac Gallen had thrown 64 pitches through five innings on Friday night when he took the hill for the sixth. He ended up needing a visit from the team's trainer and left the game before throwing another pitch. It was unclear initially what the issue was. Gallen is obviously a major piece for the Diamondbacks. He started the All-Star Game last season and was their postseason ace as they made a run to the World Series. He took a no-hitter deep into Game 5 of the World Series, too. Entering Friday, he'd pitched to a 3.00 ERA...