Quiroz made his first start for the Giants and first start in the Major Leagues since Sept. 19, 2010, for the Seattle Mariners against Texas. He went 1-for-3 in a 2-1 Mariners win over the Rangers.
"You got to be ready," Quiroz said. "You're working all the time to get these opportunities. You get here early. You do your routine. You hit in the cage. You do your weight training. You just got to be ready for anything that comes up."
Before starting against Arizona, Quiroz had made seven appearances off the bench, going 3-for-6 with a double, one RBI and one walk.
During Spring Training, Quiroz worked often with left-hander Madison Bumgarner, who started Wednesday's game against Arizona. Giants manager Bruce Bochy said Quiroz's experience catching Bumgarner was one reason he got the start.
"Yeah, that's part of the reason he's catching, and he needs to start," Bochy said. "He's been throwing out some pretty good at-bats. The little bit he's caught, he's done a nice job back there. He's got some experience in the Major Leagues, so I'm going to give him a start and some at-bats. He will get an occasional start. I'll use all three catchers."
Starter Buster Posey was out of the lineup but will start Friday night, after an off-day Thursday, when right-hander Tim Lincecum faces the Padres.
Eric Gilmore is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.