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ATP Zagreb Indoors: Ivo Karlovic bashes record-equalling 44 aces in victory | Tennis News | Sky Sports
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2022 ATP ace chart: John Isner edges Felix Auger-Aliassime and moves past Ivo Karlovic for all-time record
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HotelPlanner and Tennis Legend John Isner Announce The “Race to the World Record” Partnership and Campaign | Business Wire
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American tennis player Isner became the record holder for the number of aces in his career - Athletistic
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John Isner Inches Away From Wimbledon History, Close To Breaking Ivo Karlovic's Record for Most Aces in Tennis History - Sportsmanor
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