A Walkover occurs when there has been an administrative error or when a player decides not to play a match in an event because of injury, illness, or personal emergency. Refusal to play for any other reason is treated as a Default.
Besides, is Roland Garros the French Open?
The French Open (French: Internationaux de France de Tennis), officially known as Roland-Garros (French: [ʁɔlɑ̃ ɡaʁos]), is a major tennis tournament held over two weeks at the Stade Roland-Garros in Paris, France, beginning in late May each year. … The French Open is the premier clay court championship in the world.