I'm not sure type of spider this is. It's roughly slightly larger than a golf ball.
Araneus diadematus, may be female recently laid and hidden her eggs, looks very deflated.
If a male, I can’t see the palps to be certain.
I would actually guess this to be a nursery web spider, possibly Dolomedes tenebrosus, the Dark Fishing Spider. The posture, proportions, and eyeshine all seem right for that. On an orbweaver, I would expect to see legs that curve strongly inward, built for gripping and manipulating silk. This spider’s legs look more like it is built for running. What kind of web was this found in?