Murdock owns a 4.21 ERA and 1.15 WHIP across 25.2 innings at Triple-A this season, and he's fired three shutout frames in the majors. He'll rejoin Pittsburgh's bullpen to provide the team with another fresh arm, replacing Khristian Curtis.

Murdock made two appearances for the Pirates after getting recalled July 29. He pitched a total of three innings and allowed no runs on three hits and a 4:3 K:BB. He's getting sent down to help make room for Lake Bachar, Luke Weaver and Kirby Yates, who were all acquired in trades Monday. Brandon Eisert was also optioned to Triple-A Indianapolis on Tuesday.