Drew Reetz shook off the disappointment of a defensive error in the seventh inning that put his team behind to set the table for Omaha's fourth walk-off win in its last eight games at Tal Anderson Field.

The second baseman doubled off St. Thomas reliver Duke Coburn to lead off the bottom of the ninth and scored the decisive run when Harrison Denk drew a bases-loaded walk in a 3-2 Maverick victory.

Omaha (9-13) managed only five hits while taking two of three games from the Tommies (4-14) in the opening series of Summit League play for both teams. Two of the hits by the Mavericks came in the ninth, including the one that Reetz – sent by first-base coach Payton Kinney – stretched into a double.

"I just listened to what the other guys were saying on the pitcher. I got a pitch to hit and hit it," he said. "I was just listening to Coach Kinney. He was telling me to go. He was yelling pretty loud so I just went."

Will Hanafan followed the double with a single up the middle then took second base on the first pitch to Jack Lombardi, who grounded out. UST intentionally walked Mike Boeve. And then Coburn walked Denk.

Starting pitchers Mark Timmins and Evan Esch limited the offenses on a cold Sunday in which each team scored in the first inning and then again in the seventh. St. Thomas got its last run when Reetz misplayed a ball off a hop with two runners on in a 1-1 game. But Omaha quickly got the run back to make it 2-2.

"Drew's a hard-nosed player, and I don't think he gets shaken very easily," Maverick coach Evan Porter said. "And it showed right there. He let a ball go by him that put them ahead. But he's an even-keeled, hard-nosed player. He's going to be the same guy. He's shown that consistency throughout the season."

Mike Boeve, who is batting a league-best .383, drove in the tying run for Omaha in the seventh, driving a full-count two-out pitch the opposite way for a double that plated Hanafan to make it a 2-2 game.

Wyatt Sellers (1-0) then pitched two scoreless innings for the Mavericks to get them to the ninth with a chance to win in their final at-bat again. Coburn lost Denk on a 3-2 pitch after starting with two strikes.

"It was another tough game," Porter said. "We've got a lot of work to do. We're not playing near the caliber of baseball that we can play. To be able to win a series, and not show up well offensively, is a testament to how hard our guys are working because that's a good opponent over there."