The Philadelphia Athletics had the longest losing streak within the 1920 regular season at 18 straight games. During this streak they lost to their opponents by an average of 2.8 runs. The streak started on Jun 8, 1920 and ended on Jun 27, 1920.
| Team | Losing Streak | Start | End | Avg Margin of Defeat | |
|---|---|---|---|---|---|
| 1 | Philadelphia Athletics | 18 | Jun 8 | Jun 27 | 2.8 runs |
| 2 | Detroit Tigers | 13 | Apr 14 | May 2 | 3.6 runs |
| 3 | Boston Braves | 10 | Aug 15 | Aug 27 | 3.4 runs |
| Chicago Cubs | 10 | May 31 | Jun 11 | 2.6 runs | |
| Washington Senators | 10 | Aug 5 | Aug 14 | 2.6 runs | |
| 6 | Philadelphia Athletics | 9 | Jun 30 | Jul 6 | 4.7 runs |
| Philadelphia Phillies | 9 | May 4 | May 15 | 2.1 runs | |
| 8 | Boston Braves | 8 | May 13 | May 21 | 4.5 runs |
| Detroit Tigers | 8 | Jun 27 | Jul 5 | 5.5 runs | |
| 10 | Boston Braves | 7 | Sep 22 | Sep 27 | 3.0 runs |
| Chicago White Sox | 7 | Aug 27 | Sep 4 | 2.6 runs | |
| Detroit Tigers | 7 | Jun 5 | Jun 11 | 4.7 runs | |
| Philadelphia Athletics | 7 | Sep 25 | Oct 2 | 3.9 runs | |
| Philadelphia Phillies | 7 | May 19 | May 25 | 4.9 runs | |
| Philadelphia Phillies | 7 | Sep 15 | Sep 22 | 2.3 runs | |
| St. Louis Browns | 7 | May 23 | May 30 | 2.6 runs | |
| St. Louis Browns | 7 | Sep 4 | Sep 9 | 2.3 runs | |
| St. Louis Cardinals | 7 | Sep 5 | Sep 11 | 3.1 runs | |
| St. Louis Cardinals | 7 | Jul 25 | Aug 1 | 3.1 runs | |
| 20 | Boston Braves | 6 | Jul 10 | Jul 15 | 2.0 runs |
| Brooklyn Robins | 6 | Jun 25 | Jun 29 | 3.0 runs | |
| Cincinnati Reds | 6 | Sep 21 | Sep 25 | 2.8 runs | |
| Philadelphia Athletics | 6 | Sep 17 | Sep 23 | 6.2 runs | |
| Philadelphia Athletics | 6 | May 27 | May 31 | 4.5 runs | |
| Philadelphia Phillies | 6 | Sep 7 | Sep 11 | 3.0 runs | |
| Pittsburgh Pirates | 6 | Sep 25 | Oct 2 | 4.5 runs | |
| Washington Senators | 6 | Jun 10 | Jun 18 | 5.5 runs | |
| 28 | Boston Braves | 5 | Jul 2 | Jul 6 | 4.2 runs |
| Boston Red Sox | 5 | Jun 11 | Jun 15 | 5.4 runs | |
| Boston Red Sox | 5 | May 31 | Jun 6 | 2.8 runs | |
| Chicago Cubs | 5 | Jun 23 | Jun 27 | 3.2 runs | |
| Chicago Cubs | 5 | Jul 2 | Jul 5 | 1.8 runs | |
| Chicago Cubs | 5 | Jul 14 | Jul 17 | 1.4 runs | |
| Cincinnati Reds | 5 | Sep 9 | Sep 14 | 4.4 runs | |
| Cleveland Indians | 5 | Aug 9 | Aug 14 | 2.6 runs | |
| New York Giants | 5 | Apr 26 | May 3 | 2.6 runs | |
| Philadelphia Athletics | 5 | Apr 15 | Apr 24 | 3.2 runs | |
| Philadelphia Athletics | 5 | Sep 10 | Sep 13 | 2.8 runs | |
| Philadelphia Athletics | 5 | Jul 10 | Jul 15 | 2.8 runs | |
| Pittsburgh Pirates | 5 | May 26 | May 31 | 2.0 runs | |
| Pittsburgh Pirates | 5 | Sep 16 | Sep 20 | 1.6 runs | |
| St. Louis Cardinals | 5 | Jun 18 | Jun 23 | 3.6 runs | |
| Washington Senators | 5 | Jul 6 | Jul 10 | 6.2 runs | |
| Washington Senators | 5 | Sep 16 | Sep 19 | 2.4 runs | |
| 45 | Boston Braves | 4 | Sep 1 | Sep 5 | 4.8 runs |
| Boston Braves | 4 | Sep 6 | Sep 9 | 4.2 runs | |
| Boston Braves | 4 | Jun 12 | Jun 19 | 3.8 runs | |
| Boston Braves | 4 | Jul 18 | Jul 21 | 3.5 runs | |
| Boston Braves | 4 | Apr 18 | Apr 24 | 3.0 runs | |
| Boston Red Sox | 4 | Jul 28 | Jul 31 | 6.0 runs | |
| Boston Red Sox | 4 | Sep 14 | Sep 17 | 4.5 runs | |
| Boston Red Sox | 4 | Jul 6 | Jul 8 | 3.8 runs | |
| Boston Red Sox | 4 | Sep 5 | Sep 7 | 3.5 runs | |
| Boston Red Sox | 4 | May 27 | May 29 | 3.0 runs | |
| Boston Red Sox | 4 | Jul 22 | Jul 25 | 2.8 runs | |
| Boston Red Sox | 4 | Jul 16 | Jul 19 | 2.8 runs | |
| Brooklyn Robins | 4 | Jun 10 | Jun 13 | 4.0 runs | |
| Brooklyn Robins | 4 | Oct 9 | Oct 12 | 3.8 runs | |
| Brooklyn Robins | 4 | Aug 28 | Aug 30 | 3.5 runs | |
| Brooklyn Robins | 4 | Jun 15 | Jun 22 | 2.8 runs | |
| Chicago Cubs | 4 | Jul 10 | Jul 12 | 5.2 runs | |
| Chicago Cubs | 4 | Sep 11 | Sep 13 | 3.8 runs | |
| Chicago Cubs | 4 | Apr 14 | Apr 18 | 3.0 runs | |
| Chicago Cubs | 4 | Aug 4 | Aug 6 | 2.8 runs | |
| Chicago White Sox | 4 | May 8 | May 12 | 3.0 runs | |
| Cincinnati Reds | 4 | Aug 26 | Aug 29 | 4.0 runs | |
| Cleveland Indians | 4 | Jun 3 | Jun 6 | 3.5 runs | |
| Cleveland Indians | 4 | Aug 23 | Aug 26 | 2.0 runs | |
| Detroit Tigers | 4 | Sep 4 | Sep 6 | 3.8 runs | |
| Detroit Tigers | 4 | Jun 19 | Jun 23 | 3.5 runs | |
| New York Giants | 4 | May 31 | Jun 2 | 4.0 runs | |
| New York Giants | 4 | Jun 30 | Jul 2 | 3.8 runs | |
| New York Giants | 4 | Jun 12 | Jun 15 | 2.0 runs | |
| New York Giants | 4 | Aug 30 | Sep 1 | 1.2 runs | |
| New York Yankees | 4 | Sep 16 | Sep 19 | 4.5 runs | |
| Philadelphia Athletics | 4 | Jun 3 | Jun 7 | 4.0 runs | |
| Philadelphia Athletics | 4 | Jul 24 | Jul 29 | 2.8 runs | |
| Philadelphia Phillies | 4 | Aug 21 | Aug 25 | 4.0 runs | |
| Philadelphia Phillies | 4 | Aug 7 | Aug 11 | 4.0 runs | |
| Philadelphia Phillies | 4 | Jul 24 | Jul 28 | 3.5 runs | |
| Philadelphia Phillies | 4 | Jun 12 | Jun 17 | 2.2 runs | |
| Pittsburgh Pirates | 4 | Aug 8 | Aug 11 | 4.2 runs | |
| St. Louis Browns | 4 | Jul 21 | Jul 25 | 5.2 runs | |
| St. Louis Browns | 4 | Sep 26 | Sep 29 | 4.5 runs | |
| St. Louis Cardinals | 4 | May 28 | May 30 | 4.5 runs | |
| St. Louis Cardinals | 4 | Aug 3 | Aug 7 | 3.0 runs | |
| St. Louis Cardinals | 4 | Jun 28 | Jul 1 | 3.0 runs | |
| Washington Senators | 4 | May 31 | Jun 2 | 4.5 runs | |
| Washington Senators | 4 | Jul 16 | Jul 17 | 4.2 runs | |
| Washington Senators | 4 | Sep 26 | Sep 28 | 2.2 runs |
Yes, one losing streak during the 1920 MLB season is in the all time top 50 losing streaks in the same season. The 18 game losing streak by the Philadelphia Athletics is the 15th longest same season losing streak in MLB history.
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