"I felt good going into that at-bat," Gearrin said. "It was fun, getting that opportunity. I've never faced a sinker like that. I feel like I missed it by a lot on all those swings. But coming away with that [win] made it a lot of fun."
One batter later, Denard Span lifted the Giants past the Rockies with an RBI single, giving Gearrin his second win (2-2) of the season. The right hander entered in the 12th inning and delivered three innings of two-hit ball.
Coincidently, Gearrin owns wins in the Giants' two longest games of the year. He tossed two innings when the Giants defeated the Reds in 17 innings last month.
"We extended Gearrin a little further than he's accustomed to going," Giants manager Bruce Bochy said. "And we needed it. He became our long man once we reached extra innings.
"What a beautiful job he did. He got in a couple of jams but made pitches and got a well-deserved win."
With the outing, Gearrin lowered his ERA to a team-leading 1.98. Gearrin said he enjoyed pushing himself long past the ninth inning, as he did during San Francisco's other marathon game this season.
His only other at-bat, which came in 2016, was a single. He'd happily trade a blemished batting average for a win, though.
"I went out thinking, 'Go the other way with it.' I honestly haven't had an at-bat since the last at-bat," Gearrin said. "Not even like BP or anything. When I got up there, the adrenaline just kind of took over -- swing as hard as you can."
Gearrin said he could have pitched more if needed, but joked that Bochy likely wouldn't have allowed him to take another at-bat.
"He's a pro," Bochy said. "He has experience. We really extended him today but he's had a good year for us."
Jonathan Hawthorne is a reporter for MLB.com based in the Bay Area.