O'Brien (3-5) took the loss Sunday against the Phillies, allowing six runs on five hits and a walk over two-thirds of an inning.
O'Brien was called in for a non-save situation to protect a 4-0 lead in the ninth inning, but five straight Phillies reached safely with two outs, including a Kyle Schwarber two-run homer that stuck the Cardinals closer with a brutal loss. Coming into Sunday, the 31-year-old O'Brien had turned in 12 straight scoreless appearances, holding opponents to just two hits over 11.1 innings in that span. He's converted 33 saves this season while posting a 3.93 ERA, 1.22 WHIP and 53:23 K:BB across 52.2 innings.