The Nittany Lions were originally scheduled to play at 7 p.m. on Tuesday.
A sixth inning grand slam was too much for the Nittany Lions to overcome.
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.
The Nittany Lions missed last year's tournament.
Roberson transferred after two years with UConn.