Angelique Kerber suffered a shock first-round defeat on the opening day of the French Open.
The number-five seed went down to 18-year-old Anastasia Potapova in straight sets, 6-4, 6-2.
Kerber, the reigning Wimbledon champion, was aiming to complete her career slam at Roland Garros.
2016 winner Garbine Muguruza came from a set down to beat Taylor Townsend 5-7 6-2 6-2, while in the men's draw Stefanos Tsitsipas and Marin Cilic both progressed to the second round with straight sets wins over Maximilian Marterer and Thomas Fabbiano respectively.
Real Madrid handed shock home loss as Celta Vigo spring surprise
Dubai Capitals overpower Abu Dhabi Knight Riders by 83 runs
Mid East finished strong with victory against Arabia
Norris takes F1 title as Verstappen wins Abu Dhabi race
Neser fires Australia to eight-wicket win in second Ashes test
