AP Photo Boston Red Sox starter Nick Pivetta pitches to the Pittsburgh Pirates during the first inning of Tuesday’s game in Pittsburgh.

PITTSBURGH — Nick Pivetta pitched one-hit ball over seven shutout innings for his first win since June 24, and the Boston Red Sox scored four runs in the first inning on their way to a 5-3 victory over the Pittsburgh Pirates on Tuesday night.

The Pirates’ only hit off Pivetta came on Ben Gamel’s two-out single in the first inning on a soft liner to left-center. Pivetta (9-9) struck out six and walked three while throwing 99 pitches and retiring his last nine batters.

In his previous eight starts, Pivetta had gone 0-4 with a 7.24 ERA.

The first six Red Sox batters reached in the first inning against Mitch Keller (4-9), who lasted just two innings. He was removed because of right shoulder fatigue. Keller wound up being charged with five runs, four earned, while allowing five hits and three walks with one strikeout.

Alex Verdugo, Christian Arroyo and Eric Hosmer hit consecutive RBI singles and Kike Hernandez followed with a sacrifice fly in the first.

The Red Sox added another run in the second to make it 5-0 when center fielder Bryan Reynolds dropped Verdugo’s two-out fly ball for an error that enabled Tommy Pham to score.

Pham had two hits and scored two runs as the Red Sox won the fourth time in five games.

The miscue ended Reynolds’ 190-game errorless streak. Reynolds also had the first ejection of his career in the eighth inning when he was tossed by home plate umpire Roberto Ortiz for arguing a called third strike.

Gamel immediately followed with a three-run double to draw the Pirates within 5-3. He had two of Pittsburgh’s three hits as the Pirates lost for the ninth time in 11 games.

John Schreiber got the final out in the eighth., Matt Barnes pitched a 1-2-3 ninth for his third save in five chances.

HOLD THE PHONE

Pirates infielder Rodolfo Castro was suspended for one game by Major League Baseball on Tuesday for having a cellphone in his back pocket during a game last week.

The penalty, which included an undisclosed fine, had been set to take effect Tuesday night when the Pirates hosted Boston. The 23-year-old Castro appealed and can play until the process is complete.

“I just really want MLB to hear my version of the story and make sure they understand my heart behind everything,” Castro said through an interpreter.

Castro’s phone flew from his pocket when he made a head-first dive into third base at Arizona on Aug. 9.

TRAINER’S ROOM

Pirates: 3B Ke’Bryan Hayes (mid-back muscle strain) was placed on the 10-day IL, retroactive to Aug. 13, and INF Kevin Padlo was recalled from Triple-A Indianapolis. Padlo started at first base.

UP NEXT

Pirates: RHP Roansy Contreras (3-2, 3.78 ERA) will be recalled from Triple-A Indianapolis to make his first major league start since July 7.