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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)

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Juan Martin Del Potro in action against Ernests Gulbis 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)

Juan Martin Del Potro in action against Ernests Gulbis 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)

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Latvia's Ernests Gulbis (L) shakes hands after winning against Argentina's Juan Martin del Potro during their men's singles second round match on the fourth day of the 2017 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 6, 2017. Gulbis won the match 6-4, 6-4, 7-6. / AFP PHOTO / Oli SCARFF / RESTRICTED TO EDITORIAL USE (Photo credit should read OLI SCARFF/AFP/Getty Images)

Latvia's Ernests Gulbis (L) shakes hands after winning against Argentina's Juan Martin del Potro during their men's singles second round match on the fourth day of the 2017 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 6, 2017.
Gulbis won the match 6-4, 6-4, 7-6. / AFP PHOTO / Oli SCARFF / RESTRICTED TO EDITORIAL USE        (Photo credit should read OLI SCARFF/AFP/Getty Images)