From what to drink to what to wear to when to watch the best tennis, here’s T&C's guide to attending the U.S. Open. Since Citi Field and the Billie Jean King Tennis Center are neighbors, they share parking, but this year, the Mets are playing at home for nine of the same nights as the U.S. Open—so parking is extremely limited. Use the Open as an excuse to jump on the tenniscore trend with a chic tennis sweater or a versatile tennis skirt; however, there’s no set dress code for what to wear to the U.S. Open.