The Red Sox optioned Paez to Triple-A Worcester on Wednesday, Chris Cotillo of MassLive.com reports.
Paez really struggled Tuesday versus the Mariners in his first major-league start, getting torched for eight runs on 10 hits and two walks across 3.2 innings. The 22-year-old will yield his roster spot to Raymond Burgos, who will be available as a long-relief option.