Gilt City offers a U.S. Open 2014 Upper Promenade Ticket at the Arthur Ashe Stadium in Flushing, New York, NY, with prices starting for $16.20. That's the lowest price we could find for any U.S. Open ticket by $15. This ticket is valid for selected day or evening sessions from August 28 through September 5.
Of note: Gilt City also offer U.S. Open 2014 Lower Promenade Tickets for $48. That's a savings of $32 and the best price we could find.
Update: You'll need to apply coupon code "WGILT" to see the above prices.