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Sue Barker hosts live coverage from Wimbledon, where the men's quarter-finals are taking place. The USA have had more Wimbledon men's singles champions in the Open era than any other country, but it is now 12 years since an American man won the singles titles at the All England Club. In 2011, Mardy Fish was the only USA player to reach the last eight in both the men's and ladies' singles. Will the once-dominant force in world tennis have anything to celebrate on American Independence Day?