Mercedes-Benz is giving away 90 pair of free premium location tickets to the U.S. Open. One special winner — Mercedes is not calling this a grand prize, but most of us would consider this the top prize — will receive those free tickets from the hands of tennis legend competitor Roger Federer. The US Open ticket giveaway requires following Mercedes-Benz on Twitter @MBUSA, for information on the locations and times of the free ticket giveaway somewhere in New York City and the tri-state area, including New Jersey and Connecticut. Each location is marked by a special tennis themed 2012 ML 350 SUV, which serves as the ticket giveaway spot — first person to show up at the Twitter Rally spot gets that days’ giveaway tickets. There’s additional contest details on the Mercedes-Benz Facebook page. Mercedes is a longtime sponsor of the U.S. Open tennis championships. The ticket giveaway starts Monday, August 22nd; the US Open begins opens Tuesday, August 23rd. Click here for the official US Open website, with the full schedule of matches.