The Astros and three other teams have the worst chances of winning the 2015 World Series, according to the initial odds Thursday morning sent out by Bovada.lv, an online sportsbook. The Astros, along with the Rockies, Twins and Diamondbacks all sit at 100-to-1 odds. The Dodgers and Nationals are tied for the best chance of winning next year’s Fall Classic, at 15-to-2.