The Washington Senators had the longest losing streak within the 1948 regular season at 18 straight games. During this streak they lost to their opponents by an average of 3.8 runs. The streak started on Sep 3, 1948 and ended on Sep 18, 1948.
| Team | Losing Streak | Start | End | Avg Margin of Defeat | |
|---|---|---|---|---|---|
| 1 | Washington Senators | 18 | Sep 3 | Sep 18 | 3.8 runs |
| 2 | Chicago Cubs | 10 | Sep 9 | Sep 21 | 3.4 runs |
| Philadelphia Phillies | 10 | Aug 17 | Aug 27 | 3.5 runs | |
| 4 | Chicago White Sox | 9 | May 1 | May 15 | 6.6 runs |
| Washington Senators | 9 | Aug 15 | Aug 24 | 3.7 runs | |
| 6 | Brooklyn Dodgers | 8 | May 15 | May 23 | 4.2 runs |
| Cincinnati Reds | 8 | May 7 | May 14 | 4.0 runs | |
| Philadelphia Athletics | 8 | Aug 29 | Sep 6 | 3.4 runs | |
| Washington Senators | 8 | Jun 11 | Jun 20 | 3.5 runs | |
| 10 | Chicago Cubs | 7 | Jun 3 | Jun 8 | 3.4 runs |
| Chicago White Sox | 7 | Jul 6 | Jul 15 | 4.1 runs | |
| New York Giants | 7 | Aug 26 | Aug 31 | 1.7 runs | |
| Philadelphia Phillies | 7 | Jul 5 | Jul 11 | 5.6 runs | |
| 14 | Brooklyn Dodgers | 6 | Jun 26 | Jul 2 | 3.2 runs |
| Chicago White Sox | 6 | Jul 21 | Jul 24 | 4.0 runs | |
| Chicago White Sox | 6 | Aug 13 | Aug 20 | 3.7 runs | |
| Chicago White Sox | 6 | Sep 6 | Sep 11 | 2.3 runs | |
| Cincinnati Reds | 6 | Jul 27 | Jul 31 | 3.3 runs | |
| Philadelphia Phillies | 6 | Sep 4 | Sep 7 | 3.7 runs | |
| Pittsburgh Pirates | 6 | Sep 17 | Sep 20 | 2.7 runs | |
| St. Louis Browns | 6 | Aug 25 | Aug 29 | 5.3 runs | |
| St. Louis Browns | 6 | Jun 3 | Jun 6 | 3.7 runs | |
| St. Louis Cardinals | 6 | May 29 | Jun 2 | 3.5 runs | |
| 24 | Boston Red Sox | 5 | May 6 | May 10 | 4.4 runs |
| Brooklyn Dodgers | 5 | Aug 21 | Aug 25 | 2.4 runs | |
| Chicago Cubs | 5 | Jul 28 | Jul 31 | 4.8 runs | |
| Chicago Cubs | 5 | Jul 18 | Jul 21 | 4.0 runs | |
| Chicago White Sox | 5 | Sep 17 | Sep 22 | 4.2 runs | |
| Chicago White Sox | 5 | Aug 25 | Aug 29 | 4.0 runs | |
| Chicago White Sox | 5 | Jun 24 | Jun 27 | 2.6 runs | |
| Cincinnati Reds | 5 | Aug 8 | Aug 15 | 4.8 runs | |
| Cleveland Indians | 5 | Jun 13 | Jun 18 | 2.4 runs | |
| Detroit Tigers | 5 | Apr 23 | Apr 27 | 2.8 runs | |
| Detroit Tigers | 5 | Jun 17 | Jun 23 | 2.4 runs | |
| New York Giants | 5 | Jun 13 | Jun 18 | 2.8 runs | |
| Philadelphia Athletics | 5 | Aug 20 | Aug 25 | 5.8 runs | |
| Philadelphia Athletics | 5 | Jun 5 | Jun 9 | 4.0 runs | |
| Philadelphia Athletics | 5 | Sep 19 | Sep 23 | 2.4 runs | |
| Philadelphia Phillies | 5 | Jun 13 | Jun 19 | 2.8 runs | |
| Philadelphia Phillies | 5 | Sep 22 | Sep 28 | 2.0 runs | |
| Philadelphia Phillies | 5 | Aug 8 | Aug 11 | 1.8 runs | |
| St. Louis Browns | 5 | Jul 17 | Jul 20 | 4.0 runs | |
| St. Louis Browns | 5 | Sep 19 | Sep 24 | 1.4 runs | |
| St. Louis Browns | 5 | Jun 8 | Jun 12 | 1.4 runs | |
| St. Louis Cardinals | 5 | Jun 9 | Jun 13 | 4.2 runs | |
| St. Louis Cardinals | 5 | Jun 29 | Jul 4 | 3.4 runs | |
| Washington Senators | 5 | Apr 26 | May 2 | 2.8 runs | |
| Washington Senators | 5 | Jul 16 | Jul 19 | 1.4 runs | |
| 49 | Boston Braves | 4 | Apr 23 | Apr 25 | 4.8 runs |
| Boston Braves | 4 | May 26 | May 31 | 2.5 runs | |
| Boston Braves | 4 | Aug 1 | Aug 4 | 2.0 runs | |
| Boston Red Sox | 4 | May 22 | May 25 | 3.5 runs | |
| Boston Red Sox | 4 | May 28 | May 30 | 2.5 runs | |
| Brooklyn Dodgers | 4 | Jun 17 | Jun 20 | 2.5 runs | |
| Brooklyn Dodgers | 4 | Sep 2 | Sep 4 | 2.2 runs | |
| Chicago Cubs | 4 | Apr 28 | May 1 | 4.8 runs | |
| Chicago Cubs | 4 | Jul 4 | Jul 5 | 3.5 runs | |
| Chicago Cubs | 4 | Aug 7 | Aug 11 | 3.0 runs | |
| Chicago White Sox | 4 | May 16 | May 20 | 5.5 runs | |
| Chicago White Sox | 4 | May 25 | May 29 | 3.2 runs | |
| Chicago White Sox | 4 | Aug 31 | Sep 4 | 2.8 runs | |
| Chicago White Sox | 4 | Apr 20 | Apr 24 | 1.8 runs | |
| Cincinnati Reds | 4 | Sep 25 | Sep 28 | 4.8 runs | |
| Cincinnati Reds | 4 | Apr 30 | May 3 | 4.5 runs | |
| Cincinnati Reds | 4 | Sep 6 | Sep 10 | 3.5 runs | |
| Cincinnati Reds | 4 | Jul 15 | Jul 17 | 3.5 runs | |
| Cincinnati Reds | 4 | Jun 18 | Jun 20 | 2.5 runs | |
| Cincinnati Reds | 4 | Aug 17 | Aug 20 | 2.2 runs | |
| Cincinnati Reds | 4 | Jun 13 | Jun 16 | 2.0 runs | |
| Cleveland Indians | 4 | May 1 | May 6 | 3.5 runs | |
| Cleveland Indians | 4 | Aug 21 | Aug 24 | 2.5 runs | |
| Cleveland Indians | 4 | Jul 22 | Jul 25 | 1.5 runs | |
| Detroit Tigers | 4 | Jul 31 | Aug 5 | 5.0 runs | |
| Detroit Tigers | 4 | Aug 29 | Sep 1 | 4.2 runs | |
| Detroit Tigers | 4 | Jun 26 | Jun 30 | 4.0 runs | |
| Detroit Tigers | 4 | Sep 6 | Sep 10 | 3.0 runs | |
| New York Giants | 4 | Sep 21 | Sep 23 | 3.0 runs | |
| New York Yankees | 4 | Aug 8 | Aug 11 | 2.2 runs | |
| New York Yankees | 4 | May 26 | May 30 | 2.2 runs | |
| New York Yankees | 4 | Jul 5 | Jul 7 | 1.0 runs | |
| Philadelphia Athletics | 4 | Jun 19 | Jun 21 | 4.0 runs | |
| Philadelphia Athletics | 4 | Sep 29 | Oct 3 | 3.8 runs | |
| Philadelphia Phillies | 4 | May 20 | May 23 | 6.8 runs | |
| Philadelphia Phillies | 4 | Aug 29 | Sep 3 | 3.8 runs | |
| Pittsburgh Pirates | 4 | Jul 15 | Jul 18 | 4.5 runs | |
| Pittsburgh Pirates | 4 | Jun 21 | Jun 25 | 4.5 runs | |
| St. Louis Browns | 4 | Aug 14 | Aug 18 | 5.0 runs | |
| St. Louis Browns | 4 | May 9 | May 12 | 2.8 runs | |
| St. Louis Browns | 4 | Jul 2 | Jul 5 | 2.5 runs | |
| St. Louis Cardinals | 4 | Jul 25 | Jul 29 | 3.5 runs | |
| St. Louis Cardinals | 4 | Aug 29 | Aug 30 | 3.2 runs | |
| St. Louis Cardinals | 4 | Sep 6 | Sep 8 | 2.5 runs | |
| Washington Senators | 4 | May 11 | May 16 | 5.5 runs | |
| Washington Senators | 4 | Aug 10 | Aug 14 | 4.8 runs | |
| Washington Senators | 4 | Aug 2 | Aug 6 | 2.0 runs |
Yes, one losing streak during the 1948 MLB season is in the all time top 50 losing streaks in the same season. The 18 game losing streak by the Washington Senators is the 15th longest same season losing streak in MLB history.
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