ETI 037 | The Art of Winning
03.17.2015 - By Jim McLennan's Essential Tennis Instruction
80% of the points in professional end with an error, 20% with a winner.
As regards unforced errors, if your opponent never misses and is patient as the day is long, would you consider missing a routine forehand in the 12th shot of a rally a forced or unforced error.
I am now believing that errors are simply errors, and the distinction is unnecessary.