Petzschner should consider retiring from tennis if he keeps on playing with this "I don't give a shit" attitude. The only point in which he was fighting was *5-4 30-30 2nd set and he netted easy forehand.
No signs of this imo. He had a bad day and obviously tried to stay calm to find his rhythm. How can you say he didn't give a shit? I didn't see any point he tanked. If you feel bad on court, you look like Petzschner looked today.
Too bad he didn't find his game early enough. Maybe this early gift for Karlovic destroyed everything (2 DFs in the first service game).
Karlovic looked breakable 2-3 times in the second set, but Philipp just didn't show a complete good returning game today.