The Padres optioned Duran to Triple-A El Paso on Tuesday.
Though he initially stuck around as a third catcher behind Luis Campusano and Freddy Fermin after Fermin returned from the injured list coming out of the All-Star break, Duran will be moved off the active roster with the Padres needing to clear a spot for one of their trade-deadline additions. Across 91 plate appearances with the big club this season, Duran has slashed .146/.222/.305 with three home runs, eight RBI and eight runs.