I am copying and pasting this info from his thread on MTF. And this was just the first page
He swears constantly (at himself, his opponent, the officials, the crowd), throws his racquet like no one's business, and even got in a fist fight with one of the bigger *******s around, Federico Luzzi.
He tries to irritate the opponent all the time by imitating him, insulting him, etc. He insults the crowd, the ball-boys, TD's. I saw him even try to change the (manual) score of a match in a challenger a few weeks ago. Italian player Federico Luzzi got a 3-month suspension for punching him in the face after a match.
Tomas Behrend on Koellerer : He plays the dirtiest game in the history of tennis "
He was playing my MATEJ BOCKO... and acted like a complete ass. He threatened to hit a cameraman with his racquet because taking the pictures was making too much noise
Then he told the fans to shut up. He got mad at the umpire for defending the cameraman, and told him to f@#$ off.
The bad part is.... most of this happened with him winning like 6-3 5-1. He's a jerk.