Tennis recreational players and is also a popular worldwide spectator sport. The four Grand Slam tournaments (also referred to as the Majors) are especially popular: the Australian Open played on hard courts, the French Open played on red clay courts, Wimbledon played on grass courts, and the US Open also played on hard courts. Historians believe that the game's ancient origin lay in 12th century northern France, where a ball was struck with the palm of the hand. Louis X of France was a keen player of jeu de paume ("game of the palm"), which evolved into real tennis, and became
Huis ter Kleef "Kaatsbaan" refers to the sport Jeu de paume, an indoor precursor of tennis or to "Kaatsen" (Frisian handball), which presumably was once played here, though in the 18th century this was probably "Kolven", a sport somewhat like golf. The St. Eloy's Hospice, an old guild hall in the center of Utrecht, similarly became a center for the Kolf sport after the guilds were disbanded. Stones from the central castle ruin can still be seen in surrounding buildings. The Kaatsbaan was used as a residence for former owners and is now also in use by the city gardens. Huis ter Kleef