Shippensburg came into today's game 1 game behind the Marauders in the PSAC East battle.
Shippensburg's Macy Luck hit a walk-off to win the game, 5-4, clinching a playoff birth with the win.
The Red Raiders claimed the season sweep over the Marauders (21-16, 8-6).
Millersville and Shippensburg are now tied for 2nd place, 4 games behind 1st place West Chester.
Both teams will now compete this weekend for seeding heading into next week's PSAC playoffs.