O'Brien allowed an unearned run on a hit and two intentional walks while failing to log a strikeout over one inning, taking a blown save in Monday's 5-4 extra-innings loss to the Giants.
O'Brien has blown two of his four save chances in September. It's part of a longer stretch of shaky pitching in which he's allowed 11 runs (nine earned) over his last six innings. The closer now has a 4.03 ERA, 1.28 WHIP and 57:26 K:BB through 58 innings while converting 36 of 43 save chances on the year.