I have a friend who does a shitton of gambling. He's the guy who bets "will a run be scored in the 1st inning." The website he has has the Orioles at 10 to 1 to sweep, and the Royals at 15 to 1.
If the Orioles are 55% to win each game:
Orioles: 55% X 55% X 55% X 55% = 9.15%, or 11 to 1.
Royals: 45% X ... - 4.1%, or 24 to 1.