The Nittany Lions crack the top 10 in the rankings after consecutive wins at home last week.
The defending champions had to save a match point on its way to a five-set victory.
The Nittany Lions suffered its first loss in a physical game against the Black Knights.
The Nittany Lions have now won two straight games at home after losing their season opener.
The defending champs start their title defense with a sweep over Creighton.
The Nittany Lions look to bounce back after failing to make the Big Ten Tournament last season.