You can say two things for sure are true about Major League Baseball on September 1: Rosters expand and it’s the official start of the stretch run to the postseason. Thus, now is a great time to check out the updated World Series odds at sportsbooks.

Odds courtesy of OddsShark.com

One quick aside about the rosters expanding: Expect most MLB games to take even longer than usual the rest of the way. That’s because managers can essentially use relievers, pinch-runners or pinch-hitters at will. It is a chance for fans of lousy teams to see potential young impact players ahead of next season. Some top prospects, though, will stay in the minors for service time/financial reasons.

The Boston Red Sox are the +333 favorites to win their fourth World Series since 2004 – before that, they hadn’t won a Fall Classic since 1918. The Sox should be favored because the have the best record in baseball, and thus home-field advantage throughout the playoffs, plus a top AL Cy Young candidate in Chris Sale and top AL MVP leader in J.D. Martinez.