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Novak Djokovic breaks Steffi Graf's mark to make him the only player ever, male or female, to top the world rankings for 378 weeks - the longest-tenured No 1 in tennis history
Novak Djokovic has overtaken legendary Steffi Graf after topping the world rankings for a record-breaking 378 weeks.
Djokovic has overtaken Graf for most weeks as world No 1 after starting his 378th week at the top of the men's rankings.
The 35-year-old Serb first became world No 1 in 2011 and has since ended the year in first place in the rankings a record seven times.