Defending champion Serena Williams must wait to seal a place in the French Open last 16 after torrential rain stopped her match against Kristina Mladenovic.
Top seed Williams won the first set 6-4 and was a tie-break away from beating her French opponent when they were forced off Court Philippe Chatrier.
The American, playing 30th seed Mladenovic for the first time, is aiming for her 22nd Grand Slam title.
Meanwhile, Venus Williams was leading Alize Cornet 2-1 when play stopped.
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