Ivo Karlović (; born 28 February 1979) is a Croatian professional tennis player. His height of 211 cm (6 ft 11 in) makes him the joint tallest ranked tennis player in history, along with Reilly Opelka. He has won eight ATP singles titles between 2007 and 2016. He is a serve-and-volleyer and officially held the record for the fastest serve recorded in professional tennis, measured at 251 km/h (156 mph), before being surpassed unofficially by Samuel Groth in 2012, and officially by John Isner in 2016. In his prime, he was considered one of the best servers on tour, and held the all-time record for career aces with 13,728 (not including Davis Cup) before the record was broken by Isner on July 1 2022. This makes him one of only five players in history to surpass 10,000 aces. His height enables him to serve with high speed and unique trajectory. Wikipedia
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