The Canadian Lacrosse Association began sponsoring box lacrosse. In 1932, the Mann Cup, the most prestigious lacrosse trophy in Canada, was contended for under box lacrosse rules for the first time. Previously, the national senior men's lacrosse championship, awarded since 1901, was competed for under field lacrosse rules. The Mann Cup is an annual tournament that presents the champion of the Western Lacrosse Association and Major Series Lacrosse in a best of seven national championship. A few years later, in 1937, the Minto Cup, began being awarded under box lacrosse rules to the junior men's champions. Currently the Canadian Lacrosse Association oversees the Mann Cup, the Minto Cup, the Presidents Cup (Senior B national championship) the Founders Cup (Junior B national championship) all under box lacrosse rules.