The Marlins optioned Munoz to Triple-A Jacksonville on Wednesday, Christina De Nicola of MLB.com reports.
Munoz was lit up for six earned runs on seven hits (including three home runs) and a walk in just 1.1 innings Tuesday, and he'll now head back to the minors in an effort to get back on track. Xzavion Curry was recalled from Jacksonville in a corresponding move, though it remains unclear if he will replace Munoz in the Marlins' rotation going forward.