LOS ANGELES (Interstat) — Pinch-hitter Patrick Bailey’s tying RBI double sparked a three-run rally in the eighth inning, and the San Francisco Giants battered Los Angeles Dodgers reliever Blake Treinen to avoid a four-game series sweep with a 3-1 victory on Sunday evening at Dodger Stadium.

The Giants, held to just one hit through seven innings by Dodgers starter Emmet Sheehan, erupted against Treinen (1-7) to snap a three-game skid. Treinen dramatically blew a 1-0 lead, allowing three runs on three hits and two walks while facing only seven batters. The 37-year-old right-hander took his fifth loss in his last seven appearances, a stretch in which he has pitched just 5 1/3 innings. Once a key contributor to the Dodgers’ championship run last season, Treinen’s latest disastrous outing ballooned his ERA to 5.55.

Sheehan was dominant, striking out 10 over seven scoreless innings while allowing just one hit and walking none. His performance was wasted, however, as the Dodgers’ bullpen struggles continued, playing a major role in the defending World Series champions’ slide toward a wild-card playoff series.

The game was a pitchers’ duel for the first six innings. Giants starter Trevor McDonald matched Sheehan zero for zero, scattering six hits and allowing one run over six strong innings with three strikeouts.

Los Angeles broke through in the seventh against Giants reliever Spencer Bivens (4-3). Max Muncy walked and Andy Pages singled before Michael Conforto lined a single to left field, scoring Muncy for a 1-0 lead. The Dodgers threatened for more, but Bivens escaped a bases-loaded jam when Tommy Edman lined into an inning-ending double play.

The momentum shifted abruptly in the top of the eighth. Christian Koss led off with a single against Treinen, and Drew Gilbert followed with another single. Bailey, pinch-hitting, then lashed a ground-rule double down the right-field line to score Koss and tie the game. After an outfield flyout, Treinen intentionally walked Rafael Devers to load the bases but then walked Willy Adames on a full count to force in the go-ahead run. Matt Chapman followed with a soft groundout to shortstop that allowed Bailey to score a crucial insurance run.

Ryan Walker retired the side in order in the ninth, striking out Michael Conforto to end the game and earn his 16th save of the season.

The Giants managed only five hits total, with Koss collecting two, including a double. The Dodgers out-hit San Francisco 7-5, with Alex Call going 1-for-2 with a double, but they went 1-for-7 with runners in scoring position.

The loss dropped the Dodgers to 88-68 on the season, while the Giants improved to 77-79. The announced attendance was 46,601, and the game time was 2 hours, 27 minutes.

San Francisco returns home to open a three-game series against the St. Louis Cardinals on Monday. The Dodgers have a day off before beginning a three-game road series against the Arizona Diamondbacks on Tuesday.