However, she dug deep into her limited reserves to win a deciding set for the fourth time this season in eight attempts.

“I have had a lot more three-set matches this year and come out successful more than in the past, which gives me more confidence,” Raducanu said.

“I think playing more matches has benefited me in the sense that I’m not out of competition for too long.

“At the same time, when I play matches, I’m really on and really intense, so it does take a lot out of me.

“Finding the perfect balance between being hungry and being ready to play and being fit enough is difficult.”

Raducanu can now focus on how to cause a shock against four-time French Open champion Swiatek, who cruised past Slovakia’s Rebecca Sramkova 6-3 6-3.

British number one Katie Boulter will aim to join Raducanu in the second round when she plays later on Monday.

Jodie Burrage, playing under a protected injury ranking, lost her opening match.

The 25-year-old was beaten 7-6 (7-1) 6-4 by American former world number seven Danielle Collins.