The Nittany Lions outscored their prior opponents 12-2, but couldn't find their footing against the Cardinal.
O'Neill notched 51 goals last season, scoring in every game.
This marks the first time this season and the first time since October 3, 2022, Penn State has been unranked.
A few former Penn State football players around the NFL suited up to help their teams secure playoff berths and take on division rivals over the weekend.
Toby Ezeonu started the season off strong with 10 kills in the first match of the season.
It's Robinson's first All-American honor and Fashanu's third.