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John Isner: American ace record holder to retire after US Open
American John Isner, who has served a record 14,411 aces, announces he will retire after the US Open following a 17-year career.
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American John Isner, who has served a record 14,411 aces, announces he will retire after the US Open following a 17-year career.
Full ArticleAmerican John Isner, who has served a record 14,411 aces, announces he will retire after the US Open following a 17-year career.