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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.
TPW = percentage of Total Points Won.

Updated weekly. Last update: 2017-02-20

DateTournamentRoundWinnerLoserScoreDRTPW
2017-01-02AucklandR16Madison BrengleSerena Williams6-4 6-7(3) 6-40.9650.5%
2017-01-02AucklandR32Ana KonjuhKirsten Flipkens6-4 3-6 6-30.9951.0%
2017-01-02BrisbaneR32Roberta VinciKateryna Bondarenko7-6(4) 6-7(4) 7-6(5)0.9348.8%
2017-01-02ShenzhenSFKaterina SiniakovaJohanna Konta1-6 6-4 6-40.8548.0%
2017-01-02ShenzhenR32Camila GiorgiAna Bogdan1-6 7-6(5) 6-30.9549.5%
2017-01-02ShenzhenR32Kristyna PliskovaAnastasija Sevastova1-6 6-3 7-6(6)0.9549.4%
2017-01-02ShenzhenR32Nina StojanovicTimea Babos1-6 7-5 6-20.9849.4%
2017-01-09HobartR16Veronica Cepede RoygAndrea Petkovic6-3 0-6 6-40.9848.4%
2017-01-09SydneyR32Caroline WozniackiMonica Puig6-3 2-6 6-40.9750.0%
2017-01-16Australian OpenR128Kristyna PliskovaViktorija Golubic6-3 2-6 6-41.0049.7%
2017-01-16Australian OpenR128Yulia PutintsevaLara Arruabarrena7-6(7) 7-6(10)0.9749.0%
2017-01-16Australian OpenR64Kristyna PliskovaIrina Camelia Begu6-4 7-6(8)0.8047.9%
2017-01-16Australian OpenR64Daria GavrilovaAna Konjuh6-2 1-6 6-40.9749.7%
2017-01-16Australian OpenR64Jennifer BradyHeather Watson2-6 7-6(3) 10-80.9849.8%
2017-01-30TaipeiQFMandy MinellaLin Zhu1-6 6-3 7-50.8648.0%
2017-01-30TaipeiR32Mandy MinellaJana Cepelova1-6 7-6(2) 6-40.9649.2%
2017-02-13DohaR16Darya KasatkinaAngelique Kerber6-4 0-6 6-40.9749.7%
2017-02-13DohaR16Shuai ZhangGarbine Muguruza7-6(3) 3-6 7-50.9850.0%
2017-02-11Fed Cup WG R1: SUI vs FRARRTimea BacsinszkyKristina Mladenovic7-6(4) 4-6 7-50.9449.0%
2017-02-11Fed Cup WG2 R1: ROU vs BELRRElise MertensIrina Camelia Begu3-6 7-5 7-50.9349.8%