Take a look at this lower leg and Achilles stretch for racquetball players I discovered this last week. It's really helped my game and recovery time.
You lie on a mat, facing up. Bend one leg, slide the foot to the buttocks.
Lift your other leg toward your face. Clasp both hands behind the knee as stretch feeling comes into play.
Dorsiflex your foot to your face--point, flex, point, flex.
Do the same stretch on the other leg.
I felt my legs move better and easier without getting tight afterwards.