The Terps overcame a two-set deficit to send the game into a pivotal fifth set.
Led by Erika Pritchard's 16 kills, the Terps rallied for their fifth win of the season.
The Illini swept the weekend series, dropping the Terps to 4-12 on the season.
Raina Terry tallied 23 kills for the Illini.
The Terps racked up 14 blocks across the three sets.
Erika Pritchard led the Terps with 14 kills.
Sam Csire and Erika Pritchard combined for 33 kills.
The Terps were without key players Sam Burgio and Jada Gardner.
The Terps are the Big Ten's leader in blocks, with 2.71 per match.
Laila Ricks and Lexy Finnerty starred as the Terps claimed their first victory of the season.