For a time, Karlović held the record for what type of serve?
Slowest
Most Accurate
Fastest
Most Unpredictable
Answer
Fastest. Standing 6' 11", Ivo Karlović from Croatia held the record for the fastest serve in professional tennis, clocking in at a staggering speed of 251 km/h (156 mph) during a Davis Cup match against Germany in 2011.