The French Open, officially Roland-Garros, is a major tennis tournament held over two weeks at the Stade Roland-Garros in Paris, France, beginning in late May. The venue is named after the French aviator Roland Garros. It is the premier clay court tennis championship event in the world and the second of four annual Grand Slam tournaments, the other three being the Australian Open, Wimbledon and the US Open. The French Open is currently the only Grand Slam event held on clay, and it is the zenith of the spring clay court season. Because of the seven rounds needed for a championship, the slow-playing surface and the best-of-five-set men's singles matches, the event is widely considered to be the most physically demanding tennis tournament in the world.