Atlanta optioned Murphy to Triple-A Gwinnett on Tuesday.
The right-hander was called up Monday and made his debut in the 10th inning against the Mets, taking the loss after giving up two runs (one earned) on a hit and a hit-by-pitch with one strikeout. Murphy will now return to Gwinnett, where he has a 3.88 ERA, 1.08 WHIP and 65:20 K:BB across 11 starts (60.1 innings) this year.