With two more wins this weekend, Michigan is now 12-2 at home on the season.
The Wolverines responded to their first two-game losing streak of the season the previous weekend to Purdue and Indiana.
The Wolverines lost the first set of both matches, but came back strong and won the second before dropping the last two.
The Wolverines turned in one of their best performances of the season to earn the upset.
Michigan staved off two late match points to outlast the reeling Terrapins, 3-2.
Welsh assisted her teammates to control the volume and momentum of the game — a performance that eventually garnered Big Ten Freshman of the Week honors.
Michigan was unable to complete the comeback, falling 13-15 to Wisconsin in the final set, just missing out on a major upset.
Michigan cruised to a 12-point margin of victory in the third set to secure a sweep of Northwestern.
The No. 23 Michigan volleyball team picked up a pair of wins against Maryland and No. 14 Ohio State this weekend, both in four sets.
The Wolverines hadn't beat Ohio State twice in a row since 2009.