O'Brien threw a clean ninth inning to earn the save Sunday against the Nationals.
The All-Star closer made quick work of Washington, retiring the side on just six pitches (all strikes). O'Brien has had a shaky month of September, converting only four of his last seven save chances, but Sunday's performance was a step in the right direction as he looks to end the campaign on a positive note. He has a 4.08 ERA, 1.28 WHIP and 64:29 K:BB over 64 innings, piling up 38 saves in 46 opportunities.