Now if a ball is coming at you spinning at 5000rpm. You can get your racquet on the ball cos it landed next to you but you can't control the spin and the ball flys off from your racquet. Is that an unforced error or not? How do you tell exactly what happened from a spectator's POV? Look at the number of UE, chances are the no. of UEs exceeds the no. of winners so many people would jump to the conclusion that tennis is a game of errors not winnings. But what if most UEs are actually "forced" and should be counted as winners? How do they tell an UE from a forced error? If A Rod comes to the net and you hit a dipper right at his foot and he nets the half volley, is that an UE? I would say it should be counted as a winner.