Las Vegas likes the Chicago Cubs much better now that Jon Lester is in the mix.

At 12-1 odds, the Cubs have moved into the top tier of favorites in Las Vegas to win the 2015 World Series.

The Cubs began the offseason at 40-1 to win the World Series at the Westgate SuperBook, but have seen their odds steadily increase over the last month with the addition of manager Joe Maddon. They were at 18-1 to begin the week at the SuperBook.

The Cubs haven't won the World Series since 1908.