He is on 470 ATP wins in career and with 4 clay tournaments,few matches in Paris and some wins in 4 hard tournaments in 2011 think he can easily get 500th win before 25th birthday
I was about to write the same.
He shoud beat Berdych tomorrow and he'll ene 2010 with minimum 471 wins. Then, 4 wins in Doha, at least
5 in Australia, 10 in Indian Wells in Miami...so before the clay season he'll have about 490 wins AT LEAST
. He will win more matches of course.