Bakko Single Curved Series BackboardBakko Single Curved Series Backboard Made similarly to the 10' Professional Flat Series, however, curved from top to bottom. The logic of this design is to simulate a tennis match while you still achieve practice, warm up and work out. When you hit the ball up, it tends to come back down toward your feet. If you hit the ball down, it tends to return up, as an opponent should in a match. Sideways, you still must run for the ball, just as in a match. On