The tennis grounds during the US Open have free admission.
You can enter the stadium for free one week before the official game to watch the players practice.
Parking is $60, which is more expensive than the actual tickets.
I have been using it now for 3 months and it saves me so much research. Reduces the need to call and double check every time.
How did I not know these places existed?! Atly's scoring is a lifesaver, now I can finally find THE spot without wasting time Googling my life away.