Me too. In an interview some time ago he said that he won't play any qualies or challengers. If this is the case, he will retire he said...
He didn't played any Challenges even in 2004 when he haven't any ranking
And his body is very vulnerable
if when he playing the challengers have any bad thing happen...It is not worth
I think if he wants there is lots of tournaments would give him the wild card（For example Munich and Halle etc.）