This year it was the Nats series to lose. Or the Red Sox. Or maybe those Padres. Or actually it could have been the White Sox.
Most money wagered to win the 2015 WS (as of opening day 2015)
1. Cubs
2. Mariners
3. Dodgers
4. Nationals
5. Giants
It was the Royals. They were built to win that championship and nothing was getting in their way.
I hope you made a lot of money on that, since the Royals were 33-1 to win the WS on opening day 2015 had an O/U of 81 wins (AL teams with more projected wins by Vegas: Orioles, Red Sox, White Sox, Indians, Tigers, Angels, Yankees, Mariners, Blue Jays)
The Jays, at 25-1 and 83.5 wins were seen as a better contender than the Royals at the start of the season (general fun fact as well: after the 2014 WS the Royals were 16-1 to win this year but then were slammed by bettors over the winter after their offseason was deemed to be wholly underwhelming).