Holderman had his contract selected by the Mets on Sunday.
The 26-year-old had a strong showing during spring training and will now receive his first look in the big leagues with Tylor Megill (biceps) headed to the injured list. Holderman has a 2.92 ERA, 0.99 WHIP and 13:3 K:BB across 12.1 innings for Triple-A Syracuse this season and should fill a low-leverage role out of the bullpen for New York.