The Nationals were +195 underdogs to the Astros in this year’s Fall Classic. Houston was the biggest World Series favorite since 2007, and with Washington’s win, it’s the largest World Series upset since the Cincinnati Reds defeated the Oakland Athletics in a four-game sweep at +260 underdogs in the 1990 World Series.
The Washington Nationals took home the 2019 World Series title in seven games on Wednesday, and while the 2020 MLB season is still five months away, odds for next fall’s World Series and pennant championships are out. The latest 2020 World Series odds have this year’s runner-up Houston Astros as 4-to-1 favorites to win it all, with the Los Angeles Dodgers and New York Yankees behind Houston with 5-to-1 odds. Eight (Astros, Dodgers, Yankees, Braves, Red Sox, Nationals, Indians and Cardinals) of baseball’s 30 teams have World Series odds of 18-to-1 or lower. 
The Astros were one game away from winning their second World Series title in three years, before the Nationals won two straight games in Houston to clinch the 2019 title. The club is expected to return the majority of their potent lineup in 2020, and they’ll once again be the team to beat in the 2020 season. Gerrit Cole will be a free agent at the conclusion of the 2019 season, and even if he departs, Houston will be bringing back Justin Verlander and Zack Greinke to lead the pitching staff. For the AL pennant, the Astros are a +225 favorite with the Yankees at +250. Over in the NL, the pennant favorites are the Dodgers with +250 odds and the Braves next on the board at +450.
After back-to-back runner-up finishes in the World Series, the Dodgers were stunned by the World Series champion Washington Nationals in Game 5 of the 2019 NLDS. Starters Hyun-Jin Ryu and Rich Hill will be free agents ahead of 2020, but otherwise, L.A. should look to roll out a similar lineup next season.
Here are the Westgate odds (as of Oct. 31) to win the 2020 World Series and both pennants.

2020 AL pennant odds

Team Odds
Houston Astros 9/4
New York Yankees 5/2
Boston Red Sox 5/1
Cleveland Indians 7/1
Tampa Bay Rays 10/1
Minnesota Twins 10/1
Oakland Athletics 15/1
Los Angeles Angels 25/1
Chicago White Sox 30/1
Toronto Blue Jays 40/1
Texas Rangers 50/1
Seattle Mariners 150/1
Baltimore Orioles 500/1
Detroit Tigers 500/1
Kansas City Royals 500/1

NL pennant odds 

Team Odds
Los Angeles Dodgers 5/2
Atlanta Braves 9/2
Washington Nationals 6/1
St. Louis Cardinals 8/1
Philadelphia Phillies 10/1
New York Mets 10/1
Chicago Cubs 10/1
Milwaukee Brewers 10/1
Arizona Diamondbacks 25/1
Cincinnati Reds 25/1
San Diego Padres 25/1
Colorado Rockies 50/1
San Francisco Giants 50/1
Pittsburgh Pirates 100/1
Miami Marlins 500/1

World Series odds

Team Odds
Houston Astros 5/1
Los Angeles Dodgers 6/1
New York Yankees 6/1
Atlanta Braves 10/1
Boston Red Sox 12/1
Washington Nationals 14/1
Cleveland Indians 16/1
St. Louis Cardinals 18/1
Chicago Cubs 20/1
Philadelphia Phillies 20/1
Milwaukee Brewers 20/1
New York Mets 20/1
Tampa Bay Rays 20/1
Minnesota Twins 20/1
Oakland Athletics 30/1
Arizona Diamondbacks 50/1
Cincinnati Reds 50/1
San Diego Padres 50/1
Los Angeles Angels 50/1
Chicago White Sox 60/1
Toronto Blue Jays 80/1
Colorado Rockies 100/1
San Francisco Giants 100/1
Texas Rangers 100/1
Pittsburgh Pirates 200/1
Seattle Mariners 300/1
Miami Marlins 1000/1
Baltimore Orioles 1000/1
Detroit Tigers 1000/1
Kansas City Royals 1000/1