The Nittany Lions defeated Cornell 12-3 and Rider 2-1 in extra innings.
Penn State needed to use eight pitchers to escape a 12-0 loss to Milwaukee on Sunday.
Pitcher Bailey Parshall had herself a weekend by earning two wins and passing 500 career strikeouts.
Penn State's relievers tossed 5.2 innings of three-hit baseball to guide the Nittany Lions to another win.
A last-minute goal gave Princeton the lead with 30 seconds left in the fourth quarter.
Three hits and two RBIs from catcher Matt Wood helped the Nittany Lions begin their homestand on a high note.