Nationals are biggest World Series underdogs since 2007

The Astros won the AL pennant as many expected, the Nationals are the biggest World Series underdogs since the Rockies in 2007.

First pitch of the World Series is set for Tuesday night as the Washington Nationals visit the Houston Astros. The Nationals are making their first-ever trip to the Fall Classic and the team opens as the biggest underdog since the Colorado Rockies in 2007. SI senior editor Albert Chen breaks down the matchup with Ryan Asselta.