Argentina's Juan Martin del Potro returns against Latvia's Ernests Gulbis 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)
