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It's possible to win a match despite losing more than half of all points, or to win a match despite winning fewer return points than your opponent does. I define "lottery matches" as those contests in which both players win at least 47% of points, the threshhold at which luck and clutch play take on a larger-than-usual role.
This table shows all WTA matches this year within a special category of lottery matches: those in which the winner lost more than 50% of points and/or lost more return points than her opponent did.
DR = Dominance Ratio, the ratio of return points won to opponent's return points won.
Updated weekly. Last update: 2017-05-22