SYRACUSE, N.Y. — Andrew Olszak went 4 for 5 and singled home two runs in the bottom of the sixth inning to break a 2-2 tie, propelling Southern Maine to a 5-3 win Thursday over Castleton in its opening game at the NCAA Division III baseball regionals.

Andrew Hillier and Devin Warren singled to start the decisive rally. Zach Quintal walked to load the bases before Olszak singled up the middle.

USM (31-11) will play a winners’ bracket game at 6 p.m. on Friday against either Tufts or The College of New Jersey, who played late Thursday night.

Matt Correale (6-4) earned the win in relief of Dalton Rice, who pitched four innings before the game was delayed for nearly three hours in the top of the fifth inning by a thunderstorm. Jake Dexter struck out five in three perfect innings to earn his 12th save of the season.

After the rain delay, Castleton (34-9) took a 2-1 lead on an RBI single by Deagan Poland in the top of the fifth. In the bottom half, USM loaded the bases, and Quintal scored on Matt Bender’s infield single to short.

USM finished with 14 hits, including two each by Hillier, Warren and Kip Richard. Hillier doubled home Paul McDonough in the seventh inning for the game’s final run after Castleton pushed across a run in the top of the seventh.

Both teams scored in the first inning. Zach Bahan singled home Poland to give Castleton a 1-0 lead, but the Huskies tied it when Dylan Hapworth’s single through the left side drove in Quintal.

Rice allowed three hits and two runs while striking out five in four-plus innings.