#1 Michael Chang (17 years, 110 days)
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At the age of 17 years and 110 days, Michael Chang remains the youngest men's player to have won a Grand Slam title.
He achieved the feat by winning the French Open in 1989, defeating the great Stefan Edberg in five grueling sets of tennis. Unfortunately, he did not manage to win a single slam after that. He did manage to reach the final of the Australian Open and US Open in 1996 but fell short in the final hurdle.
He retired in 2003 and has been coaching Japanese sensation Kei Nishikori since January 2014.
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Edited by Arvind Sriram