Juan Martin del Potro is into the Top Five for the first time in a long time. Delpo, with the help of a title in Tokyo over the weekend, is now ranked the highest he's been ranked since the May 17th, 2010 rankings. It has been a very long road back to the Top Five for former US Open champion: when del Potro suffered his wrist injury in 2010 he fell as low as 485th in the world and it was hard to know what to expect from him. However he has certainly silenced his critics for the time being and with David Ferrer perhaps sliding a bit and with Andy Murray out of commission for the rest of the season, perhaps the World No. 3 ranking is within reach for the Argentine - even before the 2014 Australian Open.
Other changes in the Top Ten saw Tomas Berdych and Roger Federer each slip down one spot: they are now ranked 6th and 7th respectively. Also Stanislas Wawrinka supplanted Richard Gasquet for the World No. 8 ranking. With that change, Wawrinka has reached new heights and if he can hang onto the ranking, or improve, then he will have a quarterfinal seed at the 2014 Aussie.
A change outside of the Top Ten saw John Isner inch up three spots to the World No. 13 position. Furthermore, Kei Nishikori failed to defend his Tokyo title and his quarterfinal exit in the 500-series event cost him five ranking spots: he's now ranked as the World No. 18.
Ivan Dodig of Croatia had a good week as he made a dent in the Beijing draw by making the semifinals. His efforts were rewarded as he gained five spots in the rankings and is now ranked 29th in the world. That is a new career high ranking for the 28-year old and he has to be happy with his efforts this season.
Feliciano Lopez, on the other hand, may be showing some signs of aging. At 32-years old his prime tennis years appear to be behind him and he slipped six spots this week down to the World No. 30 position. Lopez made the semis in Beijing in 2012 but this year in Tokyo he fell in the second round and that is what cost the Spaniard a small chunk of ranking points.
- Radek Stepanek continues to clean up at the challenger level; the 34-year old won his second challenger in as many weeks and the 125 points budged him up to the World No. 39 position
- Marcos Baghdatis lost sixteen spots in the rankings and the Cypriot is now ranked 65th in the world; his record in 2013 so far is just 14-20 and his ranking is the lowest it has been since the October 19th, 2009 rankings
- Donald Young won 100 ranking points in the Sacramento Challenger and he jumped up 22 spots as a result and is now ranked 103rd in the world
- 22-year old American Chase Buchanan is starting to make a push into the Top 200; he won a futures event in Bolivia and jumped up 36 spots as a result to crack the Top 300 (World No. 282)
- Australia may have a future star in one 'Jordan Thompson'; the 19-year old won a futures event in his home country to catapult up 93 spots to the World No. 361 position
Source for changes: ATPWorldTour.com