Ivo Karlović
Even though Ivo Karlović served at the same speed of 251 km/h (156 mph) as Jerzy Janowicz, Karlović maintains the record as the 4th fastest server in world tennis. The reason being that Karlović broke the record first, in 2011 at the 2011 Davis Cup.
Ivo Karlović
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John Isner
Currently ranked at 17th place in men’s singles, he has moved from his highest ranking of 9th which he achieved in April 2012. He holds the record for the 4th most aces in ATP history with more than 8,800 aces. He has also served the 3rd fastest serve at 253 km/h (157.2 mph) which happened at the 2016 Davis Cup.
John Isner
