The 1990 Kansas City Royals, the 1990 Minnesota Twins and the 1990 Minnesota Twins share the MLB record for the longest losing streak within the same season at 9 straight games.
In the 1990 MLB season, there were no losing streaks that were in the all time top 50 losing streaks in the same season.
| Team | Losing Streak | Start | End | Avg Margin of Defeat | |
|---|---|---|---|---|---|
| 1 | Kansas City Royals | 9 | Sep 3 | Sep 11 | 3.9 runs |
| Minnesota Twins | 9 | Jun 7 | Jun 16 | 3.8 runs | |
| Minnesota Twins | 9 | Aug 15 | Aug 24 | 3.4 runs | |
| 4 | Cincinnati Reds | 8 | Jul 24 | Jul 30 | 3.4 runs |
| Cleveland Indians | 8 | Aug 27 | Sep 3 | 5.1 runs | |
| Kansas City Royals | 8 | Jun 5 | Jun 12 | 2.4 runs | |
| Milwaukee Brewers | 8 | Jul 30 | Aug 5 | 3.9 runs | |
| Montreal Expos | 8 | Sep 21 | Sep 28 | 2.4 runs | |
| New York Yankees | 8 | Jun 2 | Jun 9 | 2.8 runs | |
| San Diego Padres | 8 | Sep 20 | Sep 26 | 4.0 runs | |
| San Diego Padres | 8 | Jul 16 | Jul 23 | 3.2 runs | |
| 12 | Atlanta Braves | 7 | Apr 12 | Apr 21 | 5.0 runs |
| Atlanta Braves | 7 | Jul 31 | Aug 7 | 3.0 runs | |
| Houston Astros | 7 | Jul 1 | Jul 7 | 5.3 runs | |
| Houston Astros | 7 | Jun 1 | Jun 7 | 4.1 runs | |
| Houston Astros | 7 | Jun 15 | Jun 22 | 3.1 runs | |
| Milwaukee Brewers | 7 | Sep 17 | Sep 24 | 2.6 runs | |
| New York Yankees | 7 | Sep 15 | Sep 21 | 2.3 runs | |
| San Diego Padres | 7 | Jun 27 | Jul 3 | 2.6 runs | |
| St. Louis Cardinals | 7 | Sep 27 | Oct 3 | 3.9 runs | |
| 21 | Atlanta Braves | 6 | Jun 13 | Jun 19 | 4.5 runs |
| Baltimore Orioles | 6 | Aug 31 | Sep 5 | 3.2 runs | |
| Boston Red Sox | 6 | Jul 5 | Jul 14 | 2.3 runs | |
| Chicago Cubs | 6 | Jun 12 | Jun 16 | 4.7 runs | |
| Chicago Cubs | 6 | Apr 19 | Apr 25 | 3.8 runs | |
| Chicago Cubs | 6 | Jul 7 | Jul 14 | 3.7 runs | |
| Cleveland Indians | 6 | Jun 3 | Jun 9 | 4.3 runs | |
| Houston Astros | 6 | May 9 | May 16 | 4.0 runs | |
| Kansas City Royals | 6 | Apr 23 | Apr 28 | 2.8 runs | |
| Los Angeles Dodgers | 6 | May 6 | May 12 | 5.3 runs | |
| Milwaukee Brewers | 6 | May 23 | May 28 | 5.3 runs | |
| Montreal Expos | 6 | Aug 1 | Aug 7 | 3.8 runs | |
| New York Yankees | 6 | Aug 10 | Aug 15 | 5.0 runs | |
| Philadelphia Phillies | 6 | Jun 22 | Jun 27 | 2.7 runs | |
| Pittsburgh Pirates | 6 | Sep 12 | Sep 18 | 2.2 runs | |
| San Francisco Giants | 6 | Jul 18 | Jul 24 | 5.0 runs | |
| Toronto Blue Jays | 6 | Jun 25 | Jun 30 | 3.3 runs | |
| 38 | Atlanta Braves | 5 | Sep 26 | Sep 30 | 3.8 runs |
| Atlanta Braves | 5 | Jul 25 | Jul 29 | 2.8 runs | |
| Atlanta Braves | 5 | Apr 24 | Apr 28 | 2.8 runs | |
| Baltimore Orioles | 5 | Aug 25 | Aug 29 | 4.8 runs | |
| Baltimore Orioles | 5 | Jun 13 | Jun 17 | 2.6 runs | |
| Baltimore Orioles | 5 | Apr 24 | Apr 28 | 2.2 runs | |
| Baltimore Orioles | 5 | Jun 21 | Jun 26 | 1.4 runs | |
| California Angels | 5 | May 3 | May 7 | 3.2 runs | |
| Chicago Cubs | 5 | Jun 3 | Jun 7 | 3.0 runs | |
| Chicago White Sox | 5 | Aug 25 | Aug 29 | 4.4 runs | |
| Chicago White Sox | 5 | Jun 15 | Jun 19 | 3.6 runs | |
| Cincinnati Reds | 5 | Aug 17 | Aug 20 | 2.8 runs | |
| Cincinnati Reds | 5 | Jun 8 | Jun 12 | 2.6 runs | |
| Detroit Tigers | 5 | Apr 29 | May 3 | 4.4 runs | |
| Detroit Tigers | 5 | May 26 | May 30 | 2.2 runs | |
| Los Angeles Dodgers | 5 | Jun 10 | Jun 15 | 2.0 runs | |
| Milwaukee Brewers | 5 | Jun 6 | Jun 10 | 4.4 runs | |
| Milwaukee Brewers | 5 | Jun 28 | Jul 3 | 2.6 runs | |
| Montreal Expos | 5 | Jul 16 | Jul 20 | 3.4 runs | |
| New York Mets | 5 | Sep 4 | Sep 7 | 2.6 runs | |
| New York Mets | 5 | Sep 16 | Sep 21 | 2.2 runs | |
| New York Yankees | 5 | Aug 30 | Sep 3 | 7.2 runs | |
| New York Yankees | 5 | Jul 1 | Jul 6 | 4.8 runs | |
| New York Yankees | 5 | Sep 6 | Sep 10 | 4.0 runs | |
| New York Yankees | 5 | Jul 8 | Jul 15 | 3.2 runs | |
| New York Yankees | 5 | Apr 29 | May 3 | 3.2 runs | |
| New York Yankees | 5 | Apr 18 | Apr 22 | 3.0 runs | |
| New York Yankees | 5 | May 26 | May 30 | 2.8 runs | |
| Philadelphia Phillies | 5 | May 26 | Jun 1 | 5.4 runs | |
| Philadelphia Phillies | 5 | Jun 8 | Jun 11 | 4.8 runs | |
| Philadelphia Phillies | 5 | Aug 8 | Aug 12 | 2.0 runs | |
| Pittsburgh Pirates | 5 | Aug 8 | Aug 12 | 3.4 runs | |
| Pittsburgh Pirates | 5 | Jun 17 | Jun 23 | 2.6 runs | |
| San Diego Padres | 5 | Apr 26 | May 1 | 3.6 runs | |
| San Diego Padres | 5 | Aug 28 | Sep 1 | 1.8 runs | |
| San Francisco Giants | 5 | Aug 12 | Aug 16 | 2.4 runs | |
| Seattle Mariners | 5 | Apr 10 | Apr 15 | 4.4 runs | |
| St. Louis Cardinals | 5 | May 2 | May 7 | 3.0 runs | |
| St. Louis Cardinals | 5 | Jun 11 | Jun 15 | 1.8 runs | |
| Texas Rangers | 5 | May 13 | May 18 | 6.0 runs | |
| Texas Rangers | 5 | May 25 | May 29 | 4.2 runs | |
| Toronto Blue Jays | 5 | May 15 | May 19 | 3.0 runs | |
| Toronto Blue Jays | 5 | Aug 24 | Aug 28 | 2.0 runs |
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