Brewers pitcher Matt Garza’s mind was going so fast when he took the mound for the first time this season that he had to take a few moments to collect himself after retiring the first hitter he faced in Tuesday’s eventual 3-2 loss to the Giants. From that point on, the Milwaukee right-hander pitched as if he had been part of the Brewers’ rotation all along instead of someone whose 2016 debut had been postponed more than eight weeks because of a strained right lat muscle.