Simona Halep eased through to the second round of Roland Garros, as did rising star Eugenie Bouchard on Tuesday.
Halep, who is seeded third in Paris, needed just over an hour to breeze through to the next round, defeating Jana Cepelova 6-2, 6-3 on Court Suzanne Lenglen.
The Roumanian arrived at Roland Garros in an injury cloud after rolling her ankle in the final of the Italian Open. However, all doubt was blown out the water with a dominating display by Halep.
The 15-time WTA winner did well to defend against Cepelova's big forehand but ultimately it was a battle of who made fewer mistakes. Halep won the battle, making 23 unforced errors to Cepelova's 29.
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The 2014 Roland Garros finalist faces German Tatjana Maria in the second round.
Elsewhere, Bouchard came back from a set down to defeat Japanese hopeful Risa Ozaki 2-6, 6-3, 6-2 to reach the second round in Paris for the fourth time in five outings.
12th seed Madison Keys, who is playing in her first grand slam since wrist surgery, eased past Australia's Ashleigh Barty 6-3, 6-2 while ninth seed Agnieszka Radwanska blitzed Fiona Ferro 6-1, 6-1 in the final ladies match of the evening.