After a thrilling walkoff last night, the Mariners will look to take the series from the team with the best winning percentage in baseball, which, you know, tough ask. The Mariners should have the advantage on the pitching side at least, sending Luis Castillo to the mound tonight to oppose journeyman reliever-turned-starter Reynaldo López. Even as a starter, López still pitches with largely a relief-typical profile of primarily fastball-slider, so the Mariners should have the opportunity to damage some fastballs if they can be disciplined enough to lay off the sliders.