The Diamondbacks recalled Pfaadt from Triple-A Reno ahead of his start Tuesday against the Giants.
Pfaadt owns a 5.92 ERA and 1.50 WHIP through 38 innings in the majors this season, but he's given up just three runs (two earned) in 10 frames since being sent down to Reno on June 4. He'll now rejoin Arizona's rotation and make his first start since April 11 against a Giants offense that's turned in a .686 OPS across its last 10 games. Juan Burgos was optioned to Triple-A in a corresponding move.