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ATP World Tour Finals: Jack Sock beats Marin Cilic

The 25-year-old beat fifth seed Marin Cilic 5-7, 6-2, 7-6 (4) to move to 1-1 in Group Boris Becker.

ATP World Tour Finals: Jack Sock beats Marin Cilic

American tennis player Jack Sock (Photo: AFP)

Eighth seed Jack Sock beat Marin Cilic to boost his chances of reaching the semifinals at the ATP Finals at the O2 Arena here.

The 25-year-old American beat fifth seed Marin Cilic of Croatia 5-7, 6-2, 7-6 (4) to move to 1-1 in Group Boris Becker on Tuesday, reports Xinhua news agency.

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Sock, who lost to Roger Federer in his opening match on Sunday, also became the first American to win at the season finale since Andy Roddick 10 years ago.

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