Over the US Open's official website you can watch live coverage of the US Open

Live @ the Open presented by American Express
What's happening right NOW? Click and tune in LIVE at the top of every hour from 11am to 7pm Eastern time for a five-minute recap of scores, expert analysis, interviews, features from around the ground and more on "Live @ the Open presented by American Express." The show originates from various locations around the USTA Billie Jean King National Tennis Center. 
 
Start your day with a 10-minute preview at 11am. Come back hourly for 5-minute shows throughout the day! Then tune in at 7pm for a 10-minute recap - complete with match highlights - and a look ahead to the night session. The complete schedule is listed below. 
 
Informative and fun - that's our formula!
 
Schedule
Days 1 - 8 Hourly 11 am to 7pm EDT
Day session preview at 11am; day session recap including highlights and a countdown to the night session at 7pm. Hourly 5-minute shows in between.
 
Days 9 - 11 2pm-9pm EDT (as quarterfinal action heats up the night)
Special day session recap including highlights/night session countdown at 7pm. Hourly 5-minute shows elsewhere.
 
Day 12 11am to 6pm EDT (full women's semifinal coverage)
Day session preview at 11am; day session recap including highlights at 6pm. Hourly 5-minute shows in between.
 
Day 13 Noon to 6pm EDT (full men's semifinal coverage)
Day session preview at noon; day session recap including highlights at 6pm. Hourly 5-minute shows in between. 7:30-8:15pm (preview of the women's final)
 
Day 14 1 to 4:30pm (final day coverage)
Hourly 5-minute shows 1-3pm. 4-4:30pm (preview of the men's final)