By Nick Georgandis
Novak Djokovic celebrated his 100th week ranked No. 1 in the world on Monday as the latest ATP rankings were released.
One more week will tie Djokovic with Andre Agassi for the eighth-most weeks ranked No. 1 in ATP history. He is also within striking distance of Rafael Nadal's seventh-place 102 and Bjorn Borg's 109, which is good for sixth place.
It is fairly likely that Nadal, currently a mere 260 points behind Djokovic and without any points to defend the rest of the year, will overpass the Serb sometime this fall.
Nadal is next scheduled to play at the China Open beginning next Monday. He will also play the Shanghai Masters, the Swiss Indoors and the BNP Paribas Masters in Paris ahead of the Barclays.
Djokovic will play all the same tournaments with the exception of the Swiss Indoors.
Outside the Top 10, France's Gilles Simon moved up two spots to No. 14 by winning Metz on Sunday, jumping Jerzy Janowciz and John Isner.
Also making a big move was Ernests Gulbis, who jumped nine spots to No. 27 by winning St. Petersburg. Gulbis is quietly having an outstanding season, 34-15 with two titles.
Gulbis was ranked 150th a year ago, and now has a chance to approach his career-high of No. 21 before year's end.
Suspended Croat Marin Cilic dropped 11 spots in the rankings to No. 35, and will plummet all the way out of them between now and when he is reinstated in 2014.
There were no moves in the Top 20, but a nice one in the Top 50, where 2010 French Open champion Francesca Schiavone jumped nine spots to No. 47 after reaching the Seoul semifinals.
Serena Williams celebrated her 155th week as No. 1. To put that number in perspective, all other active WTA players who have been ranked No. 1 at some point in their careers combined to spend 180 weeks at the top spot - Caroline Wozniacki 67; Victoria Azarenka 51; Maria Sharapova 21; Jelena Jankovic 18; Ana Ivanovic 12 and Venus Williams 11.