![ATP Tour on Twitter: "🚨 NEW WORLD RECORD 🚨 With 13,729 aces, @JohnIsner surpasses Ivo Karlovic to claim the top spot in the record books! 🔥 https://t.co/w0v5rol0Bd" / Twitter ATP Tour on Twitter: "🚨 NEW WORLD RECORD 🚨 With 13,729 aces, @JohnIsner surpasses Ivo Karlovic to claim the top spot in the record books! 🔥 https://t.co/w0v5rol0Bd" / Twitter](https://pbs.twimg.com/media/FWlvf9ZUUAAYu9D.jpg:large)
ATP Tour on Twitter: "🚨 NEW WORLD RECORD 🚨 With 13,729 aces, @JohnIsner surpasses Ivo Karlovic to claim the top spot in the record books! 🔥 https://t.co/w0v5rol0Bd" / Twitter
![ATP Zagreb Indoors: Ivo Karlovic bashes record-equalling 44 aces in victory | Tennis News | Sky Sports ATP Zagreb Indoors: Ivo Karlovic bashes record-equalling 44 aces in victory | Tennis News | Sky Sports](https://e0.365dm.com/13/07/2048x1152/ivo-karlovic-croatia_2974428.jpg)
ATP Zagreb Indoors: Ivo Karlovic bashes record-equalling 44 aces in victory | Tennis News | Sky Sports
![Croatian Ivo Karlovic Won the ATP Tour in his 41 and Records his Name After Jimmy in 42 | Sports News Croatian Ivo Karlovic Won the ATP Tour in his 41 and Records his Name After Jimmy in 42 | Sports News](https://www.infosportsworld.com/wp-content/uploads/2021/01/Ivo-Karlovic-Croatian-Tennis-Player.jpg)
Croatian Ivo Karlovic Won the ATP Tour in his 41 and Records his Name After Jimmy in 42 | Sports News
![Croatia's Ivo Karlovic in action against Argentina's Monaco during the ATP tour at the Rochusclub in..., Stock Photo, Picture And Rights Managed Image. Pic. PAH-48805499 | agefotostock Croatia's Ivo Karlovic in action against Argentina's Monaco during the ATP tour at the Rochusclub in..., Stock Photo, Picture And Rights Managed Image. Pic. PAH-48805499 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/e69b1c0d7a0f1cf3086828fd5f9f42b5/pah-48805499.jpg)
Croatia's Ivo Karlovic in action against Argentina's Monaco during the ATP tour at the Rochusclub in..., Stock Photo, Picture And Rights Managed Image. Pic. PAH-48805499 | agefotostock
![ATP Hall of Fame Championships: Croatian No 2 seed Ivo Karlovic to face Lleyton Hewitt in final | Tennis News | Sky Sports ATP Hall of Fame Championships: Croatian No 2 seed Ivo Karlovic to face Lleyton Hewitt in final | Tennis News | Sky Sports](https://e0.365dm.com/14/05/2048x1152/ivo-karlovic-rome_3146049.jpg)
ATP Hall of Fame Championships: Croatian No 2 seed Ivo Karlovic to face Lleyton Hewitt in final | Tennis News | Sky Sports
![ATP Singles World Tour player Daniel Brands of the Germany returns the ball to match winner Ivo Karlovic of Croatia during the second round of the ATP Delray Beach International Tennis Championships ATP Singles World Tour player Daniel Brands of the Germany returns the ball to match winner Ivo Karlovic of Croatia during the second round of the ATP Delray Beach International Tennis Championships](https://c8.alamy.com/comp/DM20G4/atp-singles-world-tour-player-daniel-brands-of-the-germany-returns-DM20G4.jpg)