Ivo Karlović (Croatian pronunciation: [ǐːʋo kâːrloʋitɕ]; born 28 February 1979, Zagreb) is a Croatian professional tennis player. He has won eight ATP singles titles between 2007 and 2016. Karlović\'s height of 211 cm (6 ft 11 in) makes him one of the tallest professional tennis players in history.\n', '

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 by Samuel Groth in 2012.\n', '

He is considered the best server on tour, holding the all-time record for career aces with 12,936 – and is one of only four players in history to surpass 10,000 aces. His height enables him to serve with high speed and unique trajectory.\n', '

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