 He ended his first full season with the first team appearing in 41 matches and scoring 1 goal, establishing himself as a first choice center-back.On March 31, 2018, Long scored his first goal of the 2018 season for the New York Red Bulls in a 4–3 loss to Orlando City SC.On June 6, 2018, Long scored the second goal of the match in New York's 4–0 derby win over New York City FC in the fourth round of the 2018 Lamar Hunt U.S. Open Cup.