The Nittany Lions were originally scheduled to play at 7 p.m. on Tuesday.
Horwat picked up a win and a save in two relief appearances against the Terrapins to help Penn State secure a spot in the Big Ten Tournament.
A sixth inning grand slam was too much for the Nittany Lions to overcome.
The Nittany Lions will take on the Illini at 7 p.m. on Tuesday in Omaha, Nebraska.
A three-run home run and a grand slam secured the win for Penn State.
Montgomery never saw the field at Penn State and has four years of eligibility remaining.
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