[1] He was named the National Junior College Athletic Association's Division II Baseball Player of the Year.

[3] He began the 2017 season with the Columbia Fireflies of the Class A South Atlantic League,[3] but underwent Tommy John surgery on April 4, 2018.

Assigned to the Arizona Fall League after the regular season, he had a 8.71 earned run average during 11 games and the Mets opted not to add him to their 40-man roster to protect him from the Rule 5 draft.

[6] He made his major league debut that afternoon at Citi Field and pitched a scoreless ninth inning against the Seattle Mariners.

[11] On May 4, 2023, Holderman pitched an immaculate inning against the Tampa Bay Rays, retiring Taylor Walls, Luke Raley, and Christian Bethancourt in order.