She said: "This year, the expectations are much bigger, especially in the big tournaments and the grand slams". "I don t really have nightmares", she added.
"But right now I think that I have to find to myself again and just try to forget the clay court season as soon as possible, and then reset and start from the grass courts again". "So it's a victory for her to be back on court".
Mixing winners and unforced errors in nearly equal measure, Kvitova had three break points to go 4-0 up but Boserup saw them off, although she could not overturn all the advantage.
Although maybe not, considering how Kerber has fared lately. Petra Kvitova of the Czech Republic's coach Jiri Vanek, second left, other staff members support Kvitova as she plays Julia Boserup, of the U.S, during their first round match of the French Open tennis tournament at the Rol.
The Czech, who is seeded 15 here thanks to a protected world ranking during her absence, closed out the set with a forehand victor.
Kerber's strokes were off against Makarova, who has reached two major semifinals but never been past the fourth round in Paris.
The 19-time WTA Tour victor last played competitively In November, for the Czech Republic in a Fed Cup tie against France.
Russian Makarova, ranked 40, won five of the first six games and, although she came under more pressure in the second set, she kept Kerber at arm's length.
The two-time Wimbledon champion won 6-3, 6-2 against Boserup in a match which lasted around an hour and 13 minutes, reports Efe.
"It's a pleasure to be here, I'm really glad to have made the decision that I'm going to play here", Kvitova said.
Indeed, just being there under a cloud-filled sky at Roland Garros was a victory for Kvitova, who needed surgery on her left hand the one she holds her racket with after being stabbed by an intruder in the Czech Republic in late December.
During her on-court interview, Kvitova addressed her coach, her family and others in her guest box, saying: "Thank you for everything you helped me through (in) this hard time". "Gave her a big hug".
The very first point from the 27-year-old saw her hit a signature forehand victor, which was a surprise even to Kvitova herself. And the expectations are also from me really big because I know what I can do, what I did past year.
Thiem, who reached the semifinals a year ago, comfortably beat Bernard Tomic 6-4, 6-0, 6-2. Thiem first chased a drop shot, hit a shot between his legs and sealed the point with a stunning passing shot. She was knocked out of the 2016 French Open in round three by America's Shelby Rogers.
Tennys Sandgren, a 25-year-old from Tennessee, was beaten 6-2, 6-1, 6-4 by Mikhail Kukushkin of Kazakhstan on Sunday. Her staggering longevity is illustrated by the fact that her potential second round opponent is compatriot Amanda Anisimova who, at just 15, is the youngest main draw competitor since 2005. She faces Japan's world number 94 Kurumi Nara on Sunday.