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Federer already clinches ATP finals spot; Jack Sock snaps long U.S. skid

American player Jack Sock celebrates taking the second set against Croatian Marin Cilic, during day three of the ATP World Tour Finals being played at the O2 Arena in London, Tuesday Nov. 14, 2017. ( John Walton/PA via AP)

American player Jack Sock celebrates taking the second set against Croatian Marin Cilic, during day three of the ATP World Tour Finals being played at the O2 Arena in London, Tuesday Nov. 14, 2017. ( John Walton/PA via AP)

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By The Associated Press