The Astros were not expected to be leading the American League West in May. Though the team made a dramatic 19-game improvement in 2014 following three consecutive 100-loss seasons, Baseball Prospectus’ PECOTA pegged the team to win 77 games entering this season. But a 77-win team is just one hot streak away from the 88-win total of last year’s Wild Card teams, and the Astros got theirs early.