Well, Rainer says playing week after week is his way of staying fit, keep his rythm. If he had physical problems he would have stopped playing doubles over the last weeks I think. He hasn'T been injured all year unlike the other top players so he must be doing something right for him. Even after Paris he said he is not physically tired but mentally so he will have to relax before Houston and get his head off tennis for a few days.
BTW for those who have German TV, Rainer will be on the ZDF Sportstudio tonight as an interview guest.