Pittsburgh Pirates’ Austin Hedges scores on a sacrifice fly by Jack Suwinski off Oakland Athletics relief pitcher Shintaro Fujinami during the sixth inning of Monday’s game in Pittsburgh. AP Photo

PITTSBURGH — Andrew McCutchen’s tiebreaking sacrifice fly in the eighth inning lifted Pittsburgh to a 5-4 victory over Oakland on Monday night, extending the Pirates’ win streak to six games and sending the Athletics to their record-tying 15th consecutive road loss.

The 15 straight defeats away from home, matching the Athletics’ record since they moved from Kansas City in 1968. Oakland set that mark in 1986.

The major league-worst Athletics (12-50) have lost five games in a row overall. They are on pace to finish the season exactly 100 games under .500 at 31-131.

McCutchen also singled and drew three walks to go with two RBIs. The 2013 NL MVP now has 1,998 career hits.

With the score tied at 4, Ji Hwan Bae led off the decisive eighth inning with a single off Sam Moll (0-3) and advanced to third on Austin Hedges’ one-out single. McCutchen’s sac fly plated Bae.

Angel Perdomo (1-0) retired both hitters he faced and Colin Holdeman pitched a scoreless ninth inning for his first career save. It was an eventful inning for Holderman as the first three batters reached base, but he struck out Carlos Perez with runners on the corners to end it.

Pittsburgh starter Johan Oviedo gave up three runs and four hits with five strikeouts and two walks.

Oakland left-hander JP Sears did not allow a hit until Mark Mathias’ leadoff single in the fifth but was unable to make it through the inning. Sears was charged with one run in 4 2/3 innings while allowing two hits, walking five and striking out six.

Sears has not allowed more than two runs in five consecutive starts. His nine no-decisions are the most in the major leagues.

Ryan Noda and Brent Rooker had two hits each for the Athletics.

The Athletics tied the score at 4-4 in the eighth inning on pinch-hitter Aledmys Diaz’s run-scoring double. Oakland left the bases loaded, though, when Nick Allen hit an inning-ending flyout.

Consecutive bases-loaded walks keyed a three-run sixth inning that put the Pirates 4-3. Andrew McCutchen and Bryan Reynolds each worked bases on balls off Shintaro Fujinami to tie the score at 3-all and pinch-hitter Jack Suwinski followed with a sacrifice fly.

The Athletics opened the scoring in the first inning when rookie Esteury Ruiz reached on catcher’s interference, stole his MLB-leading 30th base of the season and scored on Noda’s single. Seth Brown doubled in a run in the third and came home on Perez’s sacrifice fly to push Oakland’s lead to 3-0.

Connor Joe hit an RBI double for the Pirates in the fifth.

TRAINER’S ROOM

Athletics: LHP Kirby Snead (strained right shoulder) is expected to pitch in the Arizona Complex League on Tuesday, which will be his first game action since spring training. … RHP Freddy Tarnok (strained right shoulder) will throw a bullpen on Tuesday.

TOP PICK PROMOTED

Pirates catching prospect Henry Davis was promoted to Triple-A Indianapolis from Double-A Altoona. In 41 games at Double-A this season, the 23-year-old hit .284 with 10 home runs and seven stolen bases.

“He was performing offensively at a level where we felt like he was more than ready to meet the challenges,” Pirates general manager Ben Cherington said. “He improved as an offensive player even since spring training, focusing on the things we were challenging him on. Defensively, he’s made strides too.”

Davis was the first overall selection in the 2021 amateur draft from the University of Louisville.

EVENTFUL NIGHT FOR UMP

Sears and Oviedo were both called for pitch-clock violations. The home plate umpire was Jansen Visconti, a native of nearby Latrobe, Pennsylvania.

Visconti then ejected Oakland manager Mark Kotsay for arguing a called third strike to Noda to end the top of the seventh inning.

UP NEXT

Athletics RHP James Kaprielian (0-6, 8.12 ERA) will make his first start in June after taking the loss in all four starts in May and face RHP Mitch Keller (7-1, 3.25). Keller has eight or more strikeouts in seven consecutive starts, the longest streak by a Pirates pitcher in the modern era (since 1901).