Siri has another neat trick you may not have known about -- gambling speculation. If you ask Siri "who is going to win the World Series?" it will tell you exactly who is currently predicted to win. In this case Siri thinks the Royals are going to take the series. If you have money on the game, don't want to do your own research, and trust a machine to do your betting for you, give Siri a spin.
We will say to Siri's credit, when it doesn't know it simply does its best based on which team as a better record. If you're terrible at gambling, but just can't stop, Siri is there for you.