Take a look at the start of your swing. DBeane said "taking the club back shut" but in addition to that make sure the club is not traveling to the inside on the way back. A old shaft or those sticks that almost everbody has now set up on the ground behind the ball aiming at your target will help you see were that club is traveling. Clubhead traveling on the inside of the stick normally creates a right to left ball flight. Good luck with your season!