BOWIE, Maryland — The Portland Sea Dogs scored two unearned runs in the 10th inning and held on for a 5-4 Eastern League baseball win over the Bowie Baysox on Tuesday night in the series opener at Prince George’s Stadium.

The Sea Dogs earned their first win of the season over Bowie, and improved to 3-3 in extra innings.

With the game tied at three in the 10th, Portland scored two runs off losing pitcher Jimmy Yacabonis (1-2). With one out, Rainel Rosario reached on a throwing error by shortstop Adrian Marin, but on the play, first baseman Joey Terdoslavich committed a throwing error at third base — enabling the go-ahead run to score. Wendell Rijo added a two-out, pinch-hit RBI single.

Portland’s Austin Maddox (1-0) earned his first Double-A win, working two scoreless innings with a walk and three strikeouts.

Chandler Shepherd entered the game with the bases loaded and one out in the 10th inning and Portland leading 5-3. Jeff Kemp drew a walk, ending a streak of 17 batters in a row retired by Shepherd. The righty settled down and fanned Glynn Davis and retired Julio Borbon to earn his fifth save of the year.

The Sea Dogs took a 2-0 lead in the sixth inning on Andrew Benintendi’s two-run homer. Bowie took a 3-2 lead in their half of the sixth on Henry Urruita’s three-run homer off Teddy Stankiewicz.