well the thing about playing against me is that I easily crack under the pressure. Bowling, just like any other sport is in many ways a "mind game" and if you lose your cool or start to feel like you are going to do poorly before you even let go of the ball, that is exactly what is going to happen.
I once won the championship one week by over a hundred points and then the following week came very close to losing it to a guy who rarely bowls over 100 per game. You never know when the "suck" is just going to start happening to you in this game and I think this is true of almost any other sport as well.