Djokovic passes Nadal in titles 0:51
(CNN) --
Novak Djokovic achieved another milestone in his illustrious tennis career: tying Steffi Graf for the tennis player who has spent the most weeks at No. 1 in the world.
On Monday, Djokovic began his 377th week as the Association of Professional Tennis Players (ATP) world number 1, the longest number of weeks in that position since the ATP ranking system began in 1973.
The feat evens him with Women's Tennis Association (WTA) leader Graf, who also held the top spot for 377 weeks in her career.
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Djokovic rose back to number 1 by winning the Australian Open last month.
It is his 22nd Grand Slam title, tying Rafael Nadal for the men's tennis player with the most Grand Slam singles titles, and it is his record 10th Australian Open.
These are the tennis players with the most weeks at number 1 in the world:
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Djokovic and Graf - 377 weeks
Martina Navratilova - 332
Serena Williams-319
Roger Federer-310
Novak DjokovicSteffi GrafTennis