Jack Sock Pictures

  • MELBOURNE, AUSTRALIA - JANUARY 08: Jack Sock of the U.S.A trades in his racquet to become a ball boy in his match against Bernard Tomic of Australia during day one of the 2019 Kooyong Classic at Kooyong Lawn Tennis Club on January 08, 2019 in Melbourne, Australia. (Photo by Darrian Traynor/Getty Images)