The 2009 US Open Tennis Championship is underway at the USTA Billie Jean King National Tennis Center in Flushing, New York. The tournament which has started today will last for 14 days from 31st August till 13th September 2009. Online streaming sites such as UStream, Justin.tv and the official US Open website will be broadcasting the event LIVE. You can watch the top tennis players in the World including 5 times defending champion Roger Federer as he competes for one of the biggest prized crown of the year!