What you're seeing is the ratio of total errors to total winners for pros, college players, top juniors and every day amateur players like you and me.
The pros are hitting the ball and missing TWICE as often as they hit a winner!
That includes serves, returns, groundstrokes and volleys. All shots.
Meanwhile, elite juniors make about three times more errors than they hit winners...
...and the rest of us are hitting FOUR times more errors than winners.
The tactical conclusion is simple.
Focus on what shot selections, tactics and strategies cause the most opponent errors and you'll have the best results with the least amount of effort.
Unfortunately, most tennis players fixate on the other end of the spectrum. They desperately try to develop ball-crushing power to emulate the winners they see their favorite pros hitting in highlight reels: