O'Brien earned the save in Tuesday's 2-0 win over the Phillies, striking out one in a perfect ninth inning.
O'Brien was summoned to protect a two-run lead in the ninth inning and did so on just eight pitches. The 31-year-old has now held opponents scoreless in nine of 10 appearances since the All-Star break, securing six of seven save chances during that stretch. On the year, he's 30-for-35 in save opportunities to go along with a 3.14 ERA, 1.13 WHIP and 49:20 K across 48.2 innings.