Too bad for Luke.
I think he will have better results later on in the year though, he's not done yet.
I don't know, clay is his favorite surface. Maybe he can get some results on grass and after Wimbledon on clay, but I expect him to struggle on US hard court. Maybe he will play well in Paris and Shanghai again.
In any case, he's going to have to start winning some matches. I don't know what's going on with him, because outside of Rome in doubles, his results in both singles and doubles have really tailed off since his hot start. Maybe the personal expectations he's put on himself have been too much for him to handle.