O'Brien earned the save in Friday's 3-2 win against the Rockies, allowing no hits and one walk in a scoreless ninth inning.
O'Brien was called in to protect a 3-2 lead in the ninth inning and worked around a leadoff walk to produce a scoreless frame. The 31-year-old has now recorded six consecutive scoreless appearances. On the campaign, the right-hander owns a 3-4 record, 3.28 ERA, 1.18 WHIP, 48:20 K:BB and 28 saves through 46.2 innings.