Ivo Karlovic is a retired professional tennis player from Croatia, known for his powerful serve and tall stature, standing at 6 feet 11 inches (211 cm). He turned professional in 2000 and gained recognition for his impressive aces, holding the record for the most aces in ATP history. Throughout his career, Karlovic achieved a career-high singles ranking of No. 14 in January 2009. He participated in all four major tournaments, known as the Grand Slams, and reached the fourth round of Wimbledon and the US Open multiple times. His unique playing style made him a formidable opponent on the court.