BSC pitcher Rylan Aamold delivers during the seventh inning of Sunday's game against Miles Community College.

Drake Flesche's first walkoff home run came at a perfect time for Bismarck State College.

The sophomore from West Fargo unloaded for a game-ending three-run blast in the bottom of the eighth inning to help the Mystics polish off a sweep of first-place Miles City Community College on Sunday.

Flesche's three-run shot over the left-field fence – his team-best eighth home run of the season -- sliced through a howling 25 mile-per-hour wind, to give the Mystics an 11-8 victory. They took the opener, 9-1 at Dwyer Field.

"That's my first one ever," said Flesche, who unloaded on a 3-1 pitch. "I knew it was gone. It felt great."

Miles swept the Mystics on Saturday in Montana, 12-2 and 1-0. After BSC returned the favor Sunday, Miles leads the Mon-Dak standings at 10-2. The Mystics are 7-3.

"They're a good team. After yesterday we had to come up with something good today," Flesche said. "This is big for us. Getting the sweep today is what we needed."

Flesche's game-ender made a winner of relief pitcher Rylan Aamold, who fired three perfect innings.

"Rylan didn't pitch much in high school or in Legion ball," BSC coach Corby McGlauflin said. "He's got a ton of upside. He's going to keep getting better and better."

Flesche's homer came after Miles elected to walk Mystics' cleanup man Ryan Moormeier, and for good reason. Hitting .507 coming into the game in 67 at bats, Moormeier went 5-for-7 with six RBIs and six runs scored on the day. He also turned in a dominant complete-game effort on the mound in game 1, striking out 10 over seven innings.

"Moo's a talented guy. He's been doing a little bit of everything for us," McGlauflin said. "He's playing at a very high level."

Jared Binsfeld went 4-for-4 in the nightcap. The Mystics, now 21-6 on the season, outhit Miles 20-11 in the two games.

"We still have some guys pressing at the plate, but I thought we had some really good at bats in key situations," McGlauflin said. "(Miles) took it to us yesterday. To come back like we did today shows our guys are resilient. These were two big wins we can build on."

The Mystics are back in action on Friday, hosting Bottineau at 1 p.m.

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Reach Tribune sports editor Dave Selvig at (701) 250-8246 or david.selvig@bismarcktribune.com