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French wildcard stuns third seed in three sets
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Gauff and Andreeva also through to quarter-finals
French wildcard Lois Boisson beat third seed Jessica Pegula to reach the French Open quarter-finals and send shockwaves around Roland Garros.
The 22-year-old, ranked No 361 in the world, stunned American Pegula 3-6, 6-4, 6-4 in front of a delirious Court Philippe-Chatrier crowd.