Coco Gauff's secret weapon at Roland Garros: Chocolate cake for breakfast?

WATCH: Coco Gauff advanced to the Roland Garros quarterfinals for the second year in a row with a win over Anna Karolina Schmiedlova.

Do as I say, not as I do? ... Except when it comes to Coco Gauff's breakfast choices at Roland Garros.

The 19-year-old has had a busy fortnight, once again, at the clay-court Grand Slam as she's through to the singles and doubles quarterfinals for the second year in a row. While that doesn't leave her a lot of down time, the American is making sure to get her fill of Paris' famous patisserie when she has a free moment—even in less-than-traditional settings.

"I've been playing card games a lot, eating croissants and trying to stay away from crepes," Gauff said in her on-court interview after a 7-5, 6-2 win over Anna Karolina Schmiedlova in Monday's fourth round.

"The other day, I was eating breakfast, and I had kind of a chocolate cake thing, and my agent was like, 'Why are you eating chocolate cake for breakfast?' and I was like, 'We're in Paris; who cares?'"

Gauff's needed energy so far in her fortnight: While she didn't lose a set en route to the singles final a year ago, she's faced plenty of adversity in 2023. She dropped the first set of her first- and third-round wins over Rebeka Masarova and Mirra Andreeva, respectively, while she was also pegged back from 5-2 to 5-5 in the opening set against Schmiedlova. In doubles, she and Jessica Pegula rallied from a set down to beat Marta Kostyuk and Elena-Gabriela Ruse in Sunday's third round.

Up next might be her biggest challenge yet: a rematch of the 2022 final against world No. 1 Iga Swiatek. Though she hasn't won a set in six career matches against the Pole, Gauff says she'll relish the opportunity.

"Honestly, since last year I have been wanting to play her especially at this tournament. I figured that it was going to happen, because I figured I was going to do well and she was going to do well," Gauff told reporters in her press conference.

"I'm the type of mentality if you want to be the best, you have to beat the best. I think also if you want to improve, you have to play the best. I feel like the way my career has gone so far, if I see a level, and if I'm not quite there at that level, I know I have to improve and I feel like you don't really know what you have to improve on until you see that level.

"I think it would be almost cowardly to say that I want to not face the noise and not face the challenge, but I think that I'm up for it. I have improved a lot since last year, and she has too. I think it would be a great battle for us and for the fans, too."