Ivo Karlovic broke the world record for the fastest serve in a Davis Cup match in March . The graphic above demonstrates how . The Croat was clocked at 155 mph ( 251 kph ) to beat Andy Roddick 's previous mark . TL;DR They are seen as a potential solution if the number of aces begins to increase .
Ivo Karlovic broke the world record for the fastest serve in a Davis Cup match in March . The Croat was clocked at 155 mph ( 251 kph ) to beat Andy Roddick 's previous mark . TL;DR They are seen as a potential solution if the number of aces begins to increase .