I hope Richard feels better soon.
Maybe it isn't a serious injury but he just wants to rest enough for Wimbly.
If he needs more rest for Wimbly, he really is in pretty poor shape because he didn't have that strenuous of a French OPen.
He probably missed a golden opportunity at Queens because I suspect Murray will drop out to let his ankle heal and one would think both Nadal and Djoke would really need the rest (assuming they both make it to final) and also withdraw but Nadal has been known to play the FO final and play on grass 2 days later so who knows.
But yes hopefully it is a minor muscle problem and he is just taking precautions.