The top seeds have won through to the second round of the French Open tennis championship with Roger Federer beating Australian Peter Luczak in straight sets and Serena Williams having to overcome a slow start to beat Swiss Stefanie Voegele, also in straight sets.
The men's fourth seed Briton Andy Murray was taken to five sets by Frenchman Richard Gasquet, while third seed Novak Djokovic also won.
However, seeded players Tommy Robredo and Feliciano Lopez were both beaten.
No major upsets in the women's draw with wins for third seed Caroline Wozniacki and fifth seed Elena Dementieva.
