At the end of a stellar 2001 ATP Tour season, Hewitt claimed his maiden Nitto ATP Finals trophy in Sydney — with an unbeaten 5-0 record — to overtake Gustavo Kuerten at the top of the PIF ATP Rankings on 19 November. The 2001 US Open winner became the youngest World No. 1 in history, narrowly beating Marat Safin ’s record set in the previous year. More @Wikipedia
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