Event: Wimbledon

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Opponent Rating Result
Yunila Pereira 0 0 - 1
Shahid Fayzi 0 0 - 1
Dean Itoyah 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-400 = (0 + 400 * (0 - 3)) / 3)

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