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Ernests Gulbis in action against Juan Martin Del Potro on day four of the Wimbledon Championships at The All England Lawn Tennis and Croquet Club, Wimbledon. (Photo by Gareth Fuller/PA Images via Getty Images)

Ernests Gulbis in action against Juan Martin Del Potro on day four of the Wimbledon Championships at The All England Lawn Tennis and Croquet Club, Wimbledon. (Photo by Gareth Fuller/PA Images via Getty Images)