Ivo Karlovic officially retires from tennis - Tennis World USA
Ace machine Ivo Karlovic retires at age 44 - The Sporting Base
Ivo Karlovic retires | Career Top 5 Shots | Tennis News - Sky Sports
Ivo Karlovic announces retirement - Borneo Bulletin
Towering tennis giant who stunned Lleyton Hewitt at Wimbledon retires 21 years later - Wide World of Sports
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