#4 Bjorn Borg (18 years, 10 days)
The former world no. 1 from Sweden was arguably the greatest tennis player of his generation. He formed a formidable rivalry with a lot of tennis stars, including John McEnroe, with whom he had numerous close-fought encounters.
Borg won his first title when he was just 18 years old by defeating Manuel Orantes in the 1974 French Open final in five sets.
He went on to win a total of 11 Grand Slam titles (6 Wimbledon, 5 French Open) before retiring at the young age of 26.
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Edited by Arvind Sriram