MLS Teams with the Most Us Open Cup Wins or Canadian ChampionshipsToronto, Montreal, and Vancouver compete in the Canadian championship while the other teams compete for the US Open Cup.
Source: https://en.m.wikipedia.org/wiki/Lamar_Hunt_U.S._Open_Cup#U.https://en.m.wikipedia.org/wiki/Canadian_Championship#All-time_tablehttps://en.m.wikipedia.org/wiki/Canadian_Championship#All-time_table._Open_Cup_winners, Created on 2/12/2017
1 Toronto FC Toronto Football Club, commonly referred to as Toronto FC, is a Canadian professional soccer team based in Toronto, Ontario. The team competes in Major League Soccer as a member of the Eastern Conference. The team plays its home matches at BMO Field, located at Exhibition Place on Toronto's shoreline. ...read more.
2 Chicago Fire
3 Seattle Sounders Seattle Sounders FC is an American professional soccer club based in Seattle, Washington. The Sounders compete as a member of the Western Conference of Major League Soccer.
4 DC United
5 Montreal Impact The Montreal Impact is a Canadian professional soccer team based in Montreal, Quebec. The Impact competes as a member of the Eastern Conference in Major League Soccer.
6 Sporting Kansas City
7 Los Angeles Galaxy The LA Galaxy, also known as the Los Angeles Galaxy, is an American professional soccer franchise based in the Los Angeles suburb of Carson, California, that competes in Major League Soccer, as a member of the Western Conference. The club began play in 1996 as one of the league's eight charter members. ...read more.
8 FC Dallas FC Dallas is an American professional soccer club based in the Dallas suburb of Frisco, Texas. The club competes as a member of Major League Soccer, the top league in the United States and Canada. The franchise began play in 1996 as a charter club of the league.
9 Vancouver Whitecaps
10 Columbus Crew Columbus Crew Soccer Club is an American professional soccer club based in Columbus, Ohio. The Crew competes in Major League Soccer as a member club of the league's Eastern Conference and began play in 1996 as one of the ten charter clubs of the league.