Never seen that before from a professional. And Chang was so upset he did it twice. Not only was he disrespectful of his opponent, he also disrespected the referee, who had to chase down the balls. Got a lot of respect for Oi and the referee, none for Chang, who I used to like. If I were a sponsor I would not want anything to do with a player who would not act like a professional. And Chang was perfect through the first half of that match, drilling every shot into the heart of a pocket, then just lost it.