NEW YORK — Unhappy about being sent out to play at the rain-soaked U.S. Open, a trio of tennis stars — Rafael Nadal, Andy Roddick and Andy Murray — marched from their courts to the tournament referee’s office to voice their complaints.

A second consecutive morning-to-evening damp day at Flushing Meadows washed out all but about 15 minutes of action Wednesday, leaving nerves frayed and the schedule in disarray.