As the Astros head into a critical matchup with the Mariners tonight, Houston will be without one of its key players for at least this game and perhaps beyond. Jeremy Pena was included in the initial lineup but has now been scratched due to left oblique soreness, according to an announcement from the team. Needless to say, losing Pena would be devastating to the Astros' chances of winning the AL West, or even making the postseason given how the standings have narrowed.