#4 237 consecutive weeks at No. 1
By winning the 2004 Australian Open title, Federer ascended to the top of the ATP singles rankings for the first time in his career.
It was August 2008 when the Swiss was knocked off the perch, following a record 237 consecutive weeks at the top. To put the achievement in perspective, only 4 of the 25 other players to be ranked No. 1 have occupied the numero uno spot for a longer duration overall than Federer's mark of 237 consecutive weeks.
In the process, Federer streaked well clear of the erstwhile record of 159 weeks set by Jimmy Connors in the late 70s.
Among active players, Novak Djokovic's 122 weeks at No. 1 is the fourth longest consecutive stint atop the singles rankings in the all-time list. While Nadal is one of 9 players to be ranked No. 1 for 200 or more weeks, the Spaniard has never occupied the top spot for more than 56 consecutive weeks.
Although Federer's record of 310 weeks overall at No. 1 looks likely to be surpassed in the near future by Djokovic, the Swiss maestro's record of consecutive weeks atop the rankings looks safe for a long long time.
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