Second round Dubledon Open, was leading 5-0 in the first set, CPU to serve, all of a sudden the CPU was serving from the front and I was in the back. I could even move around in the background. Well the CPU proceeded to serve, hit the ball and it flew straight up at full speed and didn't come down again but it counted as an ace. Right after that the game froze and I had to leave it altogether. Crazy shit.
I have also had few occassions where the game would hang up while saving (that was before I enabled auto-save) and I once lost like half a year of game progress.