The address auto-generated  by Google Maps is misleading.  Target the intersection of Campus Drive and Global Lane.  Head up that driveway and park behind the RAC (Recreation and Athletic Complex) Building.   The entrance to GMU RAC Field is at the bottom of the driveway.

Nearby Amenities ...

• Subway Convenience Shop - Rogers Hall, 4400 Aquia Creek Lane ( 2 blocks from RAC Field)
• Johnson Center Food Court - Panera, Steak 'n Shake, Chipotle, Blaze Pizza, etc. (pay to park in Mason Pond Parking Deck)