There'll be no time to ease into the tournament as Barty makes her first appearance on the European red dirt since famously winning the 2019 French Open at Roland Garros.

Siegemund not only won the title in her home city of Stuttgart in 2017 but also reached the final the year before and is promising the world No.1 a tough route to the last eight after top-seeded Barty enjoyed a first-round bye.

"I have no pressure. It's really my court so in a way she's coming to my court and hopefully I can show her that also," Siegemund said after ousting compatriot Mona Barthel 6-4 3-6 6-1 on Wednesday.

Barty beat the German No.2 in straight sets their only previous meeting, in Doha last year on hard court, a surface on which she's already claimed two titles in 2021.

But Siegemund fancies herself on the slower surface.

"I do think I have more chances than on hard court," Siegemund said.

"Still, I have to play very good tennis. She's a good all-round player, I saw her also in practise this week and she's just a tough competitor because her game is so versatile.

"It's hard but I prefer to play her on clay than hard court, that's for sure.

"It would be a great win for me to do, one thing on the list as one of my biggest wins so that makes it easier to find that motivation."

Siegemund confessed to finding it tough playing without fans against Barthel.

"Against Ash, that's a different calibre and it will be a bit easier to find my inner stride because it's going to be a very hard match and it's going to be difficult for me to win," she said.

"But as hard as it is without the spectators and with it being so quiet, it's still a beautiful court that holds a lot of positive memories for me here and not everything of that goes away because the people aren't here."

Barty opted against defending her French Open crown last year while remaining in Australia during COVID-19 and has wiped the slate clean after Polish teenager Iga Swiatek surged to the title in her absence.

The 24-year-old is set to play further claycourt events in Madrid, Rome and Strasbourg before the French Open starts on May 30.

"It's a long time since I've played at the French Open obviously and it's a fresh start, a fresh start for everyone in that event," Barty said.

"If you go into a tournament thinking you're defending a title, I believe that's the wrong way to approach it."

Australian Associated Press