Castillo (1-3) took the loss Sunday, allowing three runs on seven hits and four walks while striking out three over five innings against the Cardinals.
Castillo allowed a lot of baserunners in this one -- the seven hits and four walks were both his highest totals of the season thus far -- so he was actually somewhat fortunate to limit the damage to just three runs. It's been a frustrating start for the 25-year-old, who had been trending in the right direction his last two times out but now owns an unsightly combo of a 6.51 ERA and 1.45 WHIP. He'll look to right the ship next time out Friday against the Twins.