So let's look at a statistic we might call the dominance ratio: the ratio of the winner's percentage of return points won to his opponent's percentage of return points won.

WSJ: Heard on the Pitch

That translates to a dominance ratio of 4.

WSJ: Heard on the Pitch

The result won't always conform with a sense of how close the matches were: A winner of a five-setter in which he dropped two sets in tiebreakers and won the other three sets 6-0 probably would have a higher dominance ratio than a straight-sets win in which each set was decided by a tiebreaker.

WSJ: Heard on the Pitch