BookMaker.eu listed the defending champion Red Sox as a +571 favorite to hoist the trophy. The American League East rival Yankees are listed at +581.
The Miami Marlins have the longest odds at winning it all at +100000 or 1000 to 1. The Houston Astros (+687) and Los Angeles Dodgers (+750) are next in line with the best odds to win the World Series.
BookMaker.eu oddsmakers say the Red Sox are a +266 favorite to hang the American League pennant, just ahead of the Yankees at +271.
World Series odds will likely be altered when prized free agents Bryce Harper and Manny Machado sign deals in free agency this spring. Both players are fielding high-dollar offers from multiple clubs.
The Yankees haven't appeared in a World Series since winning in 2009. Boston has won the World Series four times since 2004. The Yankees have improved their odds this offseason by making several moves in free agency, including signing shortstop Troy Tulowitzki, pitchers James Paxton and Adam Ottavino and second baseman D.J. LeMahieu.