I hate this game... But I'm the first to have proof of beating all AI's!
It's really tough, I spent probably more then half an hour figuring it out. Basically you have to go away from the middle just the right amount, move towards the middle and bounce off the line right before it disappears, then move either up or down and away from the middle again at the right moment. If executed correctly, you have a momentum advantage and should try to push the AI off as quickly as possible before it makes it more difficult for you.