The Mets outrighted Waddell to Triple-A Syracuse on Friday, Anthony DiComo of MLB.com reports.
New York designated Waddell for assignment earlier this week, and he'll remain in the organization after clearing waivers. Waddell posted a 3.45 ERA, 1.28 WHIP and 22:11 K:BB across 31.1 major-league innings last season.