1910s
| Year | American League Champion | National League Champion | World Series Champion |
|---|---|---|---|
| 1910 | Philadelphia Athletics | Chicago Cubs | Philadelphia Athletics (4-1) |
| 1911 | Philadelphia Athletics | New York Giants | Philadelphia Athletics (4-2) |
| 1912 | Boston Red Sox | New York Giants | Boston Red Sox (4-3) |
| 1913 | Philadelphia Athletics | New York Giants | Philadelphia Athletics (4-1) |
| 1914 | Philadelphia Athletics | Boston Braves | Boston Braves (4-0) |
| 1915 | Boston Red Sox | Philadelphia Phillies | Boston Red Sox (4-1) |
| 1916 | Boston Red Sox | Brooklyn Dodgers | Boston Red Sox (4-1) |
| 1917 | Chicago White Sox | New York Giants | Chicago White Sox (4-2) |
| 1918 | Boston Red Sox | Chicago Cubs | Boston Red Sox (4-2) |
| 1919 | Chicago White Sox | Cincinnati Reds | Cincinnati Reds (5-3) |
Read more about this topic: List Of Major League Baseball Seasons