Brad Keller, Jon Lester hope for improvement as Royals host Cards

It's always difficult for a starting pitcher to make back-to-back starts against the same opponent. But is it easier to come off a solid performance or a difficult outing?

The St. Louis Cardinals and Kansas City Royals will play the second game of a three-game series Saturday night with both starting pitchers facing the latter scenario.

The Cardinals will send left-hander Jon Lester (3-6, 5.57 ERA) to the mound against