Dustin Pedroia tied the game for the Red Sox in the eighth inning with his first homer since May 10. (AP)

The Red Sox earned a series split with the Mariners with a 2-1 victory Sunday in 10 innings. The win was their first extra-inning victory this season.

Trailing late, the Red Sox were able to siphon some hope in the eighth inning when Dustin Pedroia took a Jason Vargas 1-0 fastball over the left-field wall for a game-tying solo home run. A Ryan Kalish pinch-hit double followed by a Pedroia single and David Ortiz sacrifice fly in the 10th inning gave the Red Sox their first lead in a game since Friday.

Here is what went right and wrong for the Red Sox in the series finale.

WHAT WENT RIGHT

• On Vargas’ 114th pitch, Pedroia launched his first home run since May 10 to tie the game at 1-1 with one out in the eighth inning. Up until the at-bat, the second baseman was 1-for-15 for the four-game series. It was also 165 at-bats between homers for Pedroia.

• With the Red Sox trailing by a run in the fifth inning, Matt Albers came on for Doubront with one out and the bases loaded. The Sox reliever needed just one pitch to induce an inning-ending, 5-4-3 double play off the bat of Jesus Montero.

• Scott Atchison, who had hit a bit of a rough patch of late (allowing runs in two of his last four outings), turned in a solid performance, not allowing a baserunner over two innings. Atchison is now 10-for-1o in not allowing a run while pitching an outing of two innings or more.

WHAT WENT WRONG

• Doubront only allowed one run, but he struggled with his command for much of the afternoon. The lefty walked five while only lasting 4 1/3 innings, ending up throwing 103 pitches. The starter did strike out four while giving up just three hits.

• The only run allowed by Doubront came in the third inning when Chone Figgins led off the frame with a single before stealing second. Figgins moved to third on Brendan Ryan‘s single and scored via Ichiro Suzuki‘s sacrifice fly to left field. Ryan would also come away with a steal, one of the three notched against the slow-to-the-plate Doubront.

• The Red Sox squandered a golden opportunity in the second inning when Cody Ross and Adrian Gonzalez led off the inning with back-to-back singles. After a Will Middlebrooks strikeout and Daniel Nava popout, Kelly Shoppach walked to load the bases with two outs. But Nick Punto‘s line drive into the hole between shortstop and third base was snagged by a diving Kyle Seager, preventing a pair of runs.