Federer versus Grosjean

 

Rating System: Matches are rated according to basic quality of play determined by the quantity of unforced errors . Other rating systems are under development. We have chosen the parameter " percentage of unforced errors" as out basic metric because of how unpleasant it is to watch matches that are filled with careless errors. After reviewing a wide selection of matches, we have decided on a nonlinear scale as follows: 0 to 14% is an exceptional level of play. Martina Hingis has played matches at this level. Hence 0-15 is denoted as exceptional. 15 to 19% is Excellent. 20-22% is very good. 23-26% is good; 27-33% is adequate; 34-40% is poor; Above 40% is very poor (there are plenty of examples).
Player  Federer  Grosjean Match
Total Points Won  123  104  227
Total Errors  23  27  50
Earned Points  93  81  174
Percentage of Errors  18.6%  26%  22%

Who Won/Lost

  Won    
Quality of Play  Excellent  Good  Very Good
Could the loser win by just reducing their errors?      Yes
Could the loser win by just reducing their errors if their opponent also reduced their errors?      No