SAN FRANCISCO (Interstat) — The Athletics scored four runs in the ninth inning to erase a one-run deficit and defeat the San Francisco Giants 9-6 on Thursday afternoon at Oracle Park, snapping a two-game losing streak in the series and ending the Giants’ two-game winning streak against them.

The Athletics, who improved to 39-42, trailed 6-5 entering the ninth after the Giants had rallied for five runs in the sixth inning. But Oakland’s offense erupted against the Giants’ bullpen, collecting four hits and four runs off losing pitcher Caleb Kilian (2-4) to secure the victory in a game that lasted 2 hours, 56 minutes before an announced crowd of 33,089.

Geoff Hartlieb (1-0) earned the win with two scoreless innings of relief, allowing no hits and striking out one. Mason Barnett notched his second save of the season with a perfect ninth inning, striking out one.

The Giants fell to 33-47 and have lost five of their past six games.

Oakland starter Jeffrey Springs lasted 5 1/3 innings, allowing five runs on four hits and four walks while striking out five. He left with a 3-1 lead after the top of the sixth, but the Giants quickly answered.

San Francisco’s big inning came in the bottom of the sixth. After Matt Chapman grounded out to lead off, Bryce Eldridge walked and Casey Schmitt singled to put runners at first and second. Rafael Devers struck out for the second out, but Willy Adames walked to load the bases. Jung Hoo Lee followed with a triple to center field, clearing the bases and tying the game at 3-3. Victor Bericoto then crushed a two-run homer to center field, his third of the season, giving the Giants a 5-3 lead. Eric Haase struck out to end the inning.

The Athletics had taken an early lead in the fifth inning. Jeff McNeil singled to lead off, and Alika Williams doubled to left field, scoring McNeil. Henry Bolte singled, putting runners at the corners, and Nick Kurtz grounded into a force out that scored Williams, making it 2-0. After a strikeout, the inning ended with the Athletics up 2-0.

The Giants got on the board in the fourth when Adames hit a solo home run, his 14th of the season, to left-center field, cutting the deficit to 2-1.

Oakland extended the lead to 3-1 in the top of the seventh. McNeil singled and Williams singled to put two on. After a groundout moved both runners into scoring position, Nick Kurtz walked to load the bases. Shea Langeliers then singled to center field, scoring McNeil and Williams, giving the Athletics a 5-3 advantage before the Giants’ five-run sixth.

The Athletics added an insurance run in the eighth. Lawrence Butler doubled to right field, and McNeil singled to right to drive in Butler, making it 6-5.

In the decisive ninth, Henry Bolte led off with a single, and after a strikeout and a groundout, Tyler Soderstrom walked. Jonah Heim singled to left, scoring Bolte to tie the game at 6-6. Butler then singled to right, scoring Soderstrom and putting ahead 7-6. Max Muncy followed with a single to left, driving in Heim and Butler for a 9-6 lead. McNeil lined out to end the inning.

Barnett retired the Giants in order in the bottom of the ninth, striking out Bericoto, getting Haase on a popout and inducing a lineout from Drew Gilbert.

Oakland’s offense collected 15 hits on the afternoon, led by McNeil, who went 3-for-4 with an RBI and two runs scored. Williams was 2-for-4 with an RBI and a run, and Soderstrom went 2-for-4 with a walk and a run scored. Butler went 2-for-5 with an RBI and a run, and Heim went 1-for-4 with an RBI. Muncy drove in two runs with his ninth-inning single.

San Francisco managed only five hits. Lee’s triple and Bericoto’s homer accounted for the bulk of the Giants’ offense. Lee finished 1-for-4 with a triple, three RBIs and a run scored. Adames homered and walked, scoring once. Chapman walked twice in four plate appearances but did not score.

The Giants’ bullpen struggled after starter Landen Roupp left the game. Roupp pitched six innings, allowing three runs on seven hits and one walk while striking out six. He threw 96 pitches. Kilian took the loss, allowing four runs on five hits in one inning of work, walking one and striking out one.

The Athletics’ bullpen was solid aside from the sixth-inning hiccup. Matt Krook faced one batter in the sixth, allowing a hit and two earned runs while striking out one. Justin Sterner also faced one batter, allowing a hit and one earned run while striking out one. Hartlieb and Barnett combined for three scoreless innings.

The game marked the third meeting between the two teams in four days, with the Giants winning the first two games 2-1 and 3-1 on Tuesday and Wednesday. had lost four of its past five games entering Thursday, including a 9-7 home loss to the Los Angeles Angels on Sunday. The Giants had lost three of four before winning the first two games of this series.

Oakland will travel to Los Angeles to face the Angels on Friday, while the Giants return home to host the Atlanta Braves for a three-game weekend series.

Interstat’s game simulator had projected a final score of Athletics 5, Giants 3. Interstat’s ELO system had projected San Francisco with a 55.20 percent probability to win. San Francisco had been installed as a pregame favorite with a spread of minus-1.5. The total score of 15 went under the over-under line of 8.5.