What to expect from the Arthur Ashe Stadium crowd?

These crowds are the best in New York and when you watch a night tennis match at the U.S. Open, there is nothing else like it. Night matches bring out the best in the players and the crowd. I remember when the crowd actually cheered against Andy Roddick one night. This was unfathomable to me but this is the sort of crowd you get at the U.S. Open.