Walker signed a one-year deal worth a maximum of $10 million.
Laubach and Cerrato combined to win just 11/30 face-offs in the game.
Penn State's pitching allowed 13 runs on 19 hits to Iowa's offense.
The Nittany Lions will host Wisconsin in the program's first Frozen Four appearance.
The Nittany Lions slug their way to a win in the Big Ten opener.
This marked the program’s 600th win.