The Oklahoma City Dodgers scored twice in the top of the 13th inning to break a 2-2 tie in an eventual 4-2 win Thursday against the Iowa Cubs at Principal Park.

Buck Britton led off the 13th with a single for the Dodgers in their series opener against Iowa. With one out, Chris Heisey and Austin Barnes drew back-to-back walks to load the bases.

Nate Samson struck out during a 10-pitch at-bat before Elliot Johnson beat a throw from Iowa third baseman Christian Villanueva for a RBI single. Britton scored on the play for a one-run advantage and the Dodgers' first lead of the night.

With the bases loaded again, Matt Carson drew a bases-loaded walk for a two-run advantage in the Dodgers' fourth extra-inning game of the season.

Dodgers pitcher David Aardsma closed out the bottom of the 13th inning to collect his seventh save of the season.

Thursday marked the longest game for Oklahoma City since an Aug. 29, 2013 win in 14 innings against Nashville.

The win improved the league-leading Dodgers' record to 16-5 to close out the month of April in front of 4,349.

Iowa (9-11) took a 1-0 lead in the second inning on a home run to left field from Villanueva. The homer was his second of the season.

Scott Schebler knotted the game, 1-1, with a solo homer to left center field in the top of the fifth. The home run was Schebler's fifth of the season and also his fifth homer in the last 10 games.

Iowa quickly regained the lead in the bottom of the frame. Three straight singles by the I-Cubs, including a RBI single by Jonathan Mota, put Iowa ahead, 2-1.

Heisey hit his team-leading seventh homer of the season in the seventh inning to tie the game, 2-2. He entered Thursday's game pacing the PCL by averaging one home run per 7.67 at-bats this season and went deep for the fifth time in the last eight games.

Heisey and Schebler have now combined for the team's last eight home runs.

Chin-Hui Tsao earned his first win of the season on the mound for Oklahoma City, tossing two scoreless and hitless innings.

Pitcher Michael Wagner (0-1) was charged with the loss for Iowa.

The Dodgers continue their four-game road series against the Iowa Cubs at 7:08 p.m. Friday at Principal Park.