Seabold was demoted to a bullpen role Thursday, Patrick Saunders of the Denver Post reports.
Seabold was lit up for six earned runs over just 2.1 innings in his last turn through the Rockies' rotation July 15 against the Yankees, ballooning his season ERA to 7.18. Peter Lambert is coming up from Triple-A Albuquerque to start Friday's series opener in Miami.