PARIS — Canadian tennis star Eugenie Bouchard says she has overcome an eating disorder brought on by "a lot of pressure" and the added expectation that followed her breakthrough year in 2014.

Speaking after a first-round victory Tuesday at the French Open, Bouchard said she felt as though food "would come right back up" and struggled with weight loss in 2015, when her ranking slipped.

She says "before matches I was very nervous and definitely had trouble eating. And not just before matches, (it) happened to me at other meals as well."

The 22-year-old Canadian finished 2014 with a career-high year-end ranking of seventh, after her Wimbledon final loss to Petra Kvitova and semifinal appearances at the French Open and Australian Open. Her ranking fell to 48th at the end of 2015.

Bouchard cruised into the second round Tuesday, beating Germany's Laura Siegemund 6-2, 6-2.

The Montreal native played a clean match and avoided hitting into a double-fault, while Siegemund committed six. Bouchard had 13 break opportunities against Siegemund and converted five of them.

Bouchard next faces eighth seed Timea Bacsinszky of Switzerland. Bacsinszky defeated Bouchard 6-2 5-7 6-2 in the third round at Indian Wells earlier this year in their only previous meeting.

Bouchard has bounced back this season with a pair of tournament runner-up finishes. She said her play started to improve at last year's U.S. Open, where she reached the fourth round before having to withdraw after falling and sustaining a concussion.

"I had a really bad loss the week before (the U.S. Open) in New Haven and it was a reality check," Bouchard said. "It was a slap in the face."

She credited former coach Jimmy Connors for providing a "positive voice" late in the 2015 season.

Fellow Canadian Vasek Pospisil of Vancouver was eliminated after a 6-3, 6-2, 6-1 loss Tomas Berdych of the Czech Republic, and Aleksandra Wozniak of Blainville, Que., fell 6-1, 6-1 to Kazakhstan's Yulia Putintseva.

— With files from The Associated Press