I keep losing to one of my teammates. He has an all around game and likes to go up to the net. I was up 5-2 and then he switched up his game. He started to push the ball and just act like he didn't care, but he got me frustrated and beat me 7-5 6-2. He's tall and pushes the ball when his normal strategy doesn't work>?? What can I do to tire him out out or beat him?