Nadal and Federer made to wait as rain causes fixture havoc
No singles action was possible at the French Open on Wednesday, meaning the quarter-finals that had been scheduled have now been delayed until Thursday.
Both of the women's semi-finals, which includes defending champion Simona Halep's tie, will now be played on Friday with the final taking place on Saturday.
The finalist from the top half of the men's draw will have to play three days in a row, while the winners of the quarter-finals between top seed Novak Djokovic and Alexander Zverev, and Dominic Thiem and Karen Khachanov will also have to play again on Friday.
Organisers had pushed back the intended start time on Wednesday from 2pm every half an hour until 4.30pm, when they decided the forecast made any further attempts at getting under way futile.
Another headache for tournament organisers is that more rain is expected on Friday.
Tournament director Guy Forget revealed one women's semi-final could even be played on the third court, the new Simonne Mathieu garden arena, with completing the matches the main priority.
The fact that tickets for the men's semi-finals have been sold as two separate sessions is a further complication in terms of rearranging the schedule.
Forget said: "The schedule of the bad weather on Friday we know is a possibility. I just left the room to see the different options that we have. None of them are ideal because we have the ladies' and the men's to be played.
"We could technically play on two courts, on three courts, but at one point it's a call we're going to have to make.
"We have, of course, the match with Rafael Nadal and Roger Federer, which is the one that a lot of people are waiting for. But then, after that, we have two big finals, the women's and the men's, and we want to make the best we can so they can be played on time."
Such problems should be a thing of the past next year when there will be a roof on Court Philippe Chatrier.