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Result: Jack Sock overcomes John Isner to keep Swiss Indoors hopes alive

John Isner exits the Swiss Indoors championship after falling to a 7-6 6-3 defeat to Jack Sock in Basel.

Jack Sock has booked his place in the quarter-finals of the Swiss Indoors championship by beating John Isner in straight sets.

The world number 27, who has now overcome six top-15 players this calendar year, prevailed 7-6(5) 6-3 in Basel.

Both players held throughout a tight opening set, but it was the American who came out on top 7-5 in the tie-break.

Sock held once more in the second set while breaking his opponent in the eighth game to secure a straightforward passage into the final eight, where he will meet Donald Young.

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Stan Wawrinka of Switzerland returns a shot to Donald Young of the US during their 2015 US Open Men's Singles round 4 match at the USTA Billie Jean King National Tennis Center September 7, 2015 in New York.
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