Rusher put together the third-best tournament score in program history to be the Nittany Lion medalist.
Isabella Rusher is two shots off the overall lead.
The Spiders will take on the field at the Nittany Lion Invitational.
Diaz tied for the best individual finish in the last four years for Richmond.
Richmond holds a four-shot lead heading into the final round.
The defending Patriot League champions tee off on Sunday.
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The men's and women's golf teams will travel to Waterville, Ireland over Fall Break.