Sumo wrestling is considered Japan's national sport. Baseball was introduced to the country by visiting Americans in the 19th century. The Nippon Professional Baseball league is Japan's largest professional sports competition in terms of television ratings and spectators. Martial arts such as judo, karate and modern kendō are also widely practiced and enjoyed by spectators in the country. Association football has gained wide popularity since the founding of the Japan Professional Football League in 1992. Other popular sports include figure skating, golf and racing, especially auto racing.