SAN FRANCISCO — Henry Davis’ fielder’s-choice grounder brought home the go-ahead run in the 10th inning, and the Pittsburgh Pirates completed a three-game sweep of the San Francisco Giants with a 2-1 victory on Wednesday.

Pittsburgh has won five in a row. San Francisco went 0-6 on its homestand, the first time since 1896 the Giants franchise has gone winless on a homestand of six or more games, according to the Elias Sports Bureau. The Giants also dropped below .500 (54-55) for the first time this season.

San Francisco was swept last weekend by the New York Mets.

With runners at the corners in the 10th, Davis hit a comebacker to Ryan Walker (2-4). Instead of throwing to the plate to get Oneil Cruz, Walker went to second to try to get a double play. Jack Suwinski was running on the pitch and beat the throw. Davis was retired.

Isaac Mattson (3-1) worked two scoreless innings. He struck out Patrick Bailey and Heliot Ramos with runners at second and third for the final two outs.

Pittsburgh starter Mike Burrows allowed one run on three hits in six innings. He struck out seven and walked one. The Giants’ Logan Webb gave up one run on five hits in 5 2/3 innings. He struck out 11 and walked four.

Key moment

Giants right fielder Mike Yastrzemski made a spectacular catch in the eighth inning, tumbling over a low wall and into foul territory to snare a flyball by Jack Suwinski.

Key stat

Pirates pitchers retired 25 straight hitters from the last out of the fourth inning Tuesday night through the first three innings Wednesday. Ramos’ single ended the streak.

Up next

Pittsburgh’s Andrew Heaney (5-9, 4.79 ERA) faces host Colorado’s Antonio Senzatela (4-4, 6.68) on Friday. San Francisco takes on the host New York Mets and David Peterson (7-4, 2.83) on Friday.

Pirates make trade

SEATTLE (AP) — The Seattle Mariners acquired left-handed reliever Caleb Ferguson from the Pittsburgh Pirates on Wednesday, giving their bullpen another arm as they make a playoff push.

Seattle sent right-handed pitching prospect Jeter Martinez to Pittsburgh.

The 29-year-old Ferguson is 2-2 with a 3.74 ERA in 43 1/3 innings this season and joins a Mariners bullpen that ranks seventh in the majors in ERA at 3.74. Ferguson is making $3 million this year and is eligible for free agency after next season.

The 6-foot-3, 225-pound left-hander has a 3.69 ERA in 308 appearances over seven seasons with the Los Angeles Dodgers, New York Yankees, Houston Astros and Pirates.

“We are excited to add Caleb and fortify our bullpen down the stretch,” Mariners executive vice president and general manager Justin Hollander said in a statement. “He’s been one of the most reliable left-handed relievers in the game and adds postseason experience to our group.”

Seattle entered Wednesday in position for the third and final American League wild-card spot.

The 19-year-old Martinez has a 6.18 ERA in 16 starts for Class A Modesto. A native of Mexico, he was rated as the Mariners’ No. 13 overall prospect.

The Mariners also designated right-hander Collin Snider for assignment after reinstating him from the 15-day injured list.