The MLB Belt · era belt
The belt since the American League arrived
The American League's first season as a major league, 1901; this belt skips the National League's 1876–1900 years. Brooklyn Superbas won that game against Philadelphia Phillies, 12–7 on April 18, 1901.
9,548Reigns since 1901
9,548Title changes
30Franchises that held it
TwinsHolder today
Start the MLB belt with Brooklyn Superbas’ win on April 18, 1901 and it takes a different path for 0 reigns: on April 18, 1901 the new line and the original line land in the same hands, and from that day on they never differ again. Every reign since is the same reign on both belts, so this page is the era's record book rather than a second history.
Where the two lines differed
| # | Holder | From | To | Def. | How |
|---|
The era's record book
Most days held since 1901
| 1 | Detroit Tigers | 3,817 |
| 2 | Baltimore Orioles | 3,174 |
| 3 | Athletics | 3,150 |
| 4 | Chicago White Sox | 3,089 |
| 5 | Cleveland Guardians | 3,066 |
| 6 | Boston Red Sox | 2,821 |
| 7 | Minnesota Twins | 2,507 |
| 8 | New York Yankees | 2,369 |
| 9 | San Francisco Giants | 1,867 |
| 10 | Atlanta Braves | 1,864 |
Most reigns since 1901
| 1 | Detroit Tigers | 637 |
| 2 | Cleveland Guardians | 629 |
| 3 | New York Yankees | 593 |
| 4 | Chicago White Sox | 590 |
| 5 | Boston Red Sox | 588 |
| 6 | Athletics | 546 |
| 7 | Minnesota Twins | 538 |
| 8 | Baltimore Orioles | 498 |
| 9 | Chicago Cubs | 418 |
| 10 | St. Louis Cardinals | 399 |
Most defenses since 1901
| 1 | New York Yankees | 857 |
| 2 | Cleveland Guardians | 759 |
| 3 | Detroit Tigers | 674 |
| 4 | Boston Red Sox | 641 |
| 5 | Chicago White Sox | 627 |
| 6 | Athletics | 553 |
| 7 | Minnesota Twins | 547 |
| 8 | Chicago Cubs | 485 |
| 9 | Baltimore Orioles | 481 |
| 10 | San Francisco Giants | 468 |
Longest reigns of the era
| # | Reign | Defenses | Days |
|---|---|---|---|
| 1 | Philadelphia AthleticsMay 5, 1931 – May 26, 1931 | 16 | 21 |
| 2 | New York GiantsJun 17, 1904 – Jul 5, 1904 | 16 | 18 |
| 3 | New York YankeesMay 29, 1953 – Jun 16, 1953 | 15 | 18 |
| 4 | Pittsburgh PiratesMay 30, 1909 – Jun 16, 1909 | 13 | 17 |
| 5 | New York YankeesJun 28, 1941 – Jul 14, 1941 | 13 | 16 |
| 6 | Chicago CubsAug 20, 1906 – Sep 2, 1906 | 13 | 13 |
| 7 | Oakland AthleticsApr 9, 2021 – Apr 25, 2021 | 12 | 16 |
| 8 | Cleveland IndiansAug 2, 1951 – Aug 16, 1951 | 12 | 14 |
| 9 | Los Angeles DodgersJul 31, 2022 – Aug 14, 2022 | 11 | 14 |
| 10 | Milwaukee BrewersJul 6, 2025 – Jul 22, 2025 | 10 | 16 |