Top seeds Serena Williams and Novak Djokovic eased through to the French Open second round with comprehensive victories.
Williams, aiming for a 22nd Grand Slam singles title, thrashed Magdalena Rybarikova 6-2 6-0 in just 42 minutes.
Djokovic, a defeated finalist in three of the last four years, beat Chinese Taipei's Yen-Hsun Lu 6-4 6-1 6-1.
Earlier, Australian Open champion Angelique Kerber was beaten by world number 58 Kiki Bertens.
Fifth seed Victoria Azarenka was another high-profile casualty, forced to retire with a thigh injury when trailing Italy's Karin Knapp 4-0 in the third set.
But nine-time champion Rafael Nadal advanced at speed and in style, taking only one hour and 20 minutes to overcome Sam Groth 6-1 6-1 6-1.