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USA's Jack Sock celebrates winning against Serbia's Filip Krajinovic during the final of the ATP World Tour Masters 1000 indoor tennis tournament on November 5, 2017 in Paris.
Sock won the match 5-7, 6-4 and 6-1. / AFP PHOTO / CHRISTOPHE SIMON        (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)
USA's Jack Sock celebrates winning against Serbia's Filip Krajinovic during the final of the ATP World Tour Masters 1000 indoor tennis tournament on November 5, 2017 in Paris.
Sock won the match 5-7, 6-4 and 6-1. / AFP PHOTO / CHRISTOPHE SIMON        (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)

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Jack Sock's tennis sock challenge

Jack Sock - winner of the 2017 Paris Masters - is living the dream. But can he live up to his name? Can Sock guess the tennis player from their socks?

Jack Sock's tennis sock challenge

Jack Sock - winner of the 2017 Paris Masters - is living the dream. But can he live up to his name? Can Sock guess the tennis player from their socks?