For 2021 US Open runner-up Leylah Fernandez, the biggest question at this rainy-as-can-be French Open was: Should I eat a full lunch or have a tiny snack? Her second-round match, like many others, was being delayed by heavy showers, and she couldn’t possibly know when it would resume.

It turned out the 31st-seeded Canadian didn’t get back on the court later that day, so her coach made the right call by telling her to go ahead and have a plate of pasta — along with some croissants, a banana and an orange.

Then, after returning to Roland Garros the next morning, Fernandez had to wait until about 5 pm to pick things back up on Court 8 and, eventually, finish off her victory.

The wet weather keeps coming this week at the French Open.

It has been delaying and postponing matches, jumbling the schedule, prompting court changes and, all in all, creating stress and uncertainty for the world’s best tennis players.

“It is hard, more mentally than physically. You don’t know when you can mentally relax a little bit. You kind of have to be switched on all the time,” Fernandez said after winning on Thursday.

Some players handle the conditions caused by the downpours better than others, of course, whether it’s the way the dampness of the courts and the sogginess of the tennis balls affect the footing and the shot-making or the way the start-and-stop-and-restart rhythm — or lack thereof — can affect the body and the mind.

“Just this whole week, every day, you just kind of don’t know what to expect. You have to accept that,” said Peyton Stearns, the unseeded American who beat No. 10 Daria Kasatkina on Thursday in a match that didn’t start until after 9 pm.

“Getting the engine started over and over,” Ben Shelton said, “and getting cold and then warm again and then cold — it takes a big toll.”