Serena and Venus Willams are already out of this year's French Open at the second round stage.

Venus lost to 58th seed Anna Schmiedlova of Slovakia in three sets, while the defending champion Serena was beaten by 20-year-old Venezuelan-born Spaniard Garbine Muguruza, losing in straight sets by a 6-2 6-2 margin.

Jo-Wilfried Tsonga , Maria Sharapova and Roger Federer are all in second round action today.