Evergreen Karlovic earns spot in record books.
See if you can ace our ATP Tour ace quiz.
Ryan Harrison and Alex de Minaur both suffered defeats at the Hall of Fame Tennis Championships.
CoCo Vandeweghe eased into the second round of the Libema Open while Robin Haase beat Ivo Karlovic.
Alexander Zverev dropped only four games in his opening match at the French Open.
Ivo Karlovic is showing no signs of slowing down as he beat Tommy Robredo in Barcelona.
Ivo Karlovic he wasn't able to set a new record for the oldest ATP title winner.
Steve Johnson remains on track to successfully defend his US Men's Clay Court Championship title.
We look at where John Isner ranks among the ATP's best-ever servers.
John Isner lost to Steve Johnson in Houston, but still had cause for celebration.