SAN FRANCISCO (Interstat) — Rafael Devers launched a three-run homer in the sixth inning to break a scoreless duel, and four San Francisco Giants relievers combined for 3 1/3 perfect frames to seal a 5-0 victory over the Philadelphia Phillies on Wednesday afternoon at Oracle Park.

A crowd of 36,106 watched the Giants secure a series win, taking two of three from the Phillies to improve to 5-8. Philadelphia fell to .500 at 6-6.

The game’s pivotal moment arrived in the bottom of the sixth after a masterful pitchers’ duel between Philadelphia’s Aaron Nola and San Francisco’s Tyler Mahle. With two outs and two on, Devers drove a 2-1 offering from Nola over the center field wall, transforming a tense contest into a comfortable Giants lead.

Until that swing, the game was a study in frustration for both lineups. The Phillies squandered early opportunities, putting two runners on with one out in both the first and third innings against Mahle but failing to score. Mahle expertly navigated the traffic, striking out six over 5 2/3 shutout innings while allowing just three hits and two walks.

Nola was nearly as sharp for Philadelphia, scattering five hits over six innings. He had allowed only a third-inning triple to Luis Arraez and two harmless singles before the fateful sixth. Willy Adames led off that inning with a double that caromed off second baseman Bryson Stott’s glove into right field. After a walk to Arraez and a strikeout, Devers delivered his second homer of the season, a 415-foot blast that decided the game.

The Giants added two insurance runs in the eighth against the Phillies’ bullpen. Adames led off with a single against José Alvarado. Arraez then laid down a sacrifice bunt, but Alvarado’s throwing error to first allowed Adames to score all the way from first. Arraez advanced to second on the error and later scored on a sharp RBI single by Devers, his fourth run batted in of the day.

San Francisco’s bullpen was flawless. Erik Miller struck out two in a perfect seventh. Blade Tidwell and Caleb Kilian combined for a perfect eighth, and Matt Gage, who was credited with the win, recorded the final two outs of the eighth before handing it over. Gage, along with Miller, Tidwell, and Kilian, retired all 10 Phillies they faced, striking out four.

Philadelphia’s offense managed only four singles and never advanced a runner past second base after the third inning. They went 0 for 5 with runners in scoring position and left six men on base. Trea Turner, Kyle Schwarber, and Bryce Harper combined to go 2 for 10 with three walks at the top of the order, but the heart of the Phillies’ lineup could not deliver a key hit.

The victory marked a strong rebound for Mahle, who entered the game with an 0-2 record and a 7.36 ERA after rough outings against the New York Yankees and Mets. His performance Wednesday provided the Giants with a desperately needed quality start.

Nola was saddled with the loss, falling to 1-1 on the season. His final line showed three earned runs on five hits with three strikeouts and one walk over six innings.

The game defied pregame projections from Interstat, which had given the Phillies a 56.3% probability to win and projected a 4-2 Philadelphia victory. The combined five runs also fell well under the over/under line of 8.

The Giants now head east to begin a three-game series against the Baltimore Orioles on Friday. The Phillies return home to open a weekend set against the Arizona Diamondbacks, also on Friday.