Pivetta fired a perfect inning with one strikeout to earn the save in Sunday's 7-5 win over Washington.
Manager Alex Cora used an all-hands-on-deck approach in the late innings Sunday, with Eduardo Rodriguez earning the win with a scoreless eighth inning before Pivetta converted his second major-league save. The right-hander has posted a mediocre 4.66 ERA and 1.25 WHIP in 46.1 innings across 10 starts since the start of August, so he's no lock for a rotation spot should the Red Sox get past Tuesday's AL Wild Card Game versus the Yankees.