SAN RAMON -- Lindsey Chalmers had pitched several impressive games against Amador Valley High over the past two seasons without a win to show for it.
The California High pitcher's luck finally changed on Tuesday.
The Grizzlies downed the two-time defending East Bay Athletic League softball champions 1-0, thanks to an excellent outing in the circle by Chalmers and a big hit from senior Kwyn Cooper.
"It validates the girls," Cal coach Joe Callaway said. "They all feel like they're pretty good. When you're able to hang with a team like Amador, you know that you're playing good ball."
Amador Valley (13-2, 4-1 EBAL) began the season ranked No. 1 in the nation by MaxPreps.com and had won 27 straight league games dating back to 2011 behind star pitcher Johanna Grauer.
But the Grizzlies (12-3, 5-0) were able to strike for an early run, and Chalmers made the score stand up.
Cooper led off the bottom of the first inning with a triple to deep center. She then scored without a throw home on Jessica Catson's well-executed squeeze bunt.
Cooper's hit was one of only three balls that the Grizzlies hit out of the infield all afternoon.
"I know (Grauer's) not going to give me great pitches to hit, but I went up there confident," Cooper said of her triple. "She gave me a meaty pitch, I took it and it felt amazing."
Grauer allowed just two more hits the rest of the way and struck out nine, but Chalmers was just as dominant. The Grizzlies' junior scattered five hits -- all singles -- and stuck out seven.
"I think we ought to sell tickets just to watch these two girls pitch against each other," Callaway said.
Amador Valley's best scoring chance against Chalmers came in the top of the first. The Dons had runners at second and third, but Chalmers induced a flyout to end the threat.
She got out of another tight spot in the fourth inning with a pair of strikeouts after the Dons got a runner to second base with one out. Amador Valley stranded six runners in all.
And after being on the wrong end of pitching duels against Grauer three times over the past two seasons, Chalmers finally recorded a win against the Dons.
"Lindsey throws amazing every game," Catson said. "We have tremendous belief in her."