Yes, the guy is a fruitcake, and is not on a particularly good run of results/form...but what is he doing in Barcelona playing only doubles?
I find this a little strange for a top pro.
Sure, we see it when a guy is coming back from injury and maybe just wants to "test the water" by playing doubles a couple of weeks before making a singles comeback (Mahut most recently tried this, for instance). But what is Jurgen's game? It's not like he made any effort to enter the singles (original sign-up, wildcard request or last-minute decision to play qualies).
Is he injured?