Ok, he was playing in Vińa del Mar and was diqualified for verbal abuse. At the begining of the match he recieved a warning because Markus was giving him instructions, but then he got mad to the umpire because of a call, and you know the rest...
He has to control that!!! He has to focus on the match, and he can't get mad that easily, an umpire almost never changes a call, so there's no point on arguing! He has to let it go and go on playing if he wants to win...
I like them too - and our TV commentators are always talking about matches being "winnable"!!! Having seen David's match on TV it wasn't so easy I don't think - especially the second set - but he won - that's all that matters!
Good Luck in the next round David!
Supporting Djoković, Tipsarević, Soderling, Tursunov, Youzhny, Cilić and quite a few more