It seems that he is playing the European clay swing, which I think will be a little unfortunate for him.
I read somewhere recently that there was one grand slam he did aim at winning in the future and it was ... Roland-Garros
Well if I remember well, he won Houston and a challenger on clay I think as well in an island somewhere in the Caribbeans or Pacific, but it's true we don't have any memories of him on European clay
I don't know how he arrived to that conclusion he could perform well on clay, if it comes from him or from Brad Gilbert ?
Anyway, I think he can aim better now than American challengers.
Besides, for information, he's currently number 40 in the Race.