Football:

1920s: Chicago Bears. (Runnerup: Canton/Cleve. Bulldogs

1930s: Green Bay Packers (Runnerup: NY Giants

1940s: Chicago Bears (Runnerup: Cleveland Browns)

1950s: Cleveland Browns (Runnerup: Detroit Lions)

1960s: Green Bay Packers (Runnerup: San Diego Chargers)

1970s: Pittsburgh Steelers (Runnerup: Dallas Cowboys)

1980s: San Francisco 49ers (Runnerup: Washington Redskis)

1990s: Dallas Cowboys (Runnerup: Buffalo Bills)

2000s: New England Patriots (Runnerup: Pittsburgh Steelers)

2010s: leading is: Baltimore Ravens....running 2d is Green Bay Packers

Baseball:

1900s: Chicago Cubs (runnerup: Detroit Tigers

1910s: Boston Red Sox (runnerup: Philadelphia As

1920s: New York Yankees (runnerup: NY Giants)

1930s: New York Yankees (runnerup: St. Louis Cardinals)

1940s: New York Yankees (runnerup: St. Louis Cardinals)

1950s: New York Yankees (runnerup: Brooklyn/LA Dodgers)

1960s: New York Yankees (runnerup: tie: Dodgers/Cardinals)

1970s: Cincinnati Reds (runnerup: Oakland A's)

1980s: LA Dodgers (runnerup: Cardinals)

1990s: Atlanta Braves (runnerup: Yankees)

2000s: New York Yankees (runnerup: Red Sox)

2010s: leading is: SF Giants, running 2d is Cardinals, who will take lead if they win this WS, but will remain behind if they lose

Basketball:

1940s: Philadelphia Warriors (runnerup: Baltimore Bullets)

1950s: Minneapolis Lakers (runnerup: Syracuse Nationals nka Phil 76ers

1960s: Boston Celtics (runnerup: LA Lakers)

1970s: Indiana Pacers for ABA (runnerup: tie: NY Knicks/Washington Bullet)

1980s: Los Angeles Lakers (runnerup: Boston Celtics)

1990s: Chicago Bulls (runnerup: Houston Rockets

2000s: Los Angeles Lakers (runnerup: San Antonio Spurs)

2010s: leading is Miami Heat, running 2d is LA Lakers

I did not do hockey. Maybe some time.