The name depends on context
“Champions League” does not identify a single competition on its own. The supplied sources use the name for different events: a European men’s classic nine-pin bowling competition and a proposed club football tournament for the Americas. The sport and region are therefore needed to establish which event is meant.
In bowling, the competition described is the men’s Champions League organized by the Ninepin Bowling Classic section of the World Ninepin Bowling Association. The Americas Champions League, by contrast, appears in one source as a tournament proposal announced in 2015; the supplied material does not confirm that it held any editions.
The two competitions in the sources
The classic nine-pin bowling competition is an annual event for men’s clubs in Europe. The sport is played on a 19.5-metre lane, with nine pins arranged in a diamond. According to the source, the tournament began in 2002 under the name Euroleague. Its account says 16 teams qualify as national champions or through performances in international competitions, then play preliminary rounds, quarterfinals and a final stage involving four teams. Germany, Austria, the Czech Republic, Croatia and Hungary are among the countries named as having a strong tradition in the sport.
The other reference is a proposal officially called the Americas Champions League. In 2015, Riccardo Silva announced that he was working on a football tournament for 64 clubs from South America, Central America, North America and the Caribbean, to be played in a knockout format. The source presents plans and aims, but does not establish that the competition went ahead. The name can therefore refer to distinct events; by itself, it is not enough to conclude that someone means a particular European football tournament.