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In addition to Onsala BK, 171 other teams from 29 different countries played in Boys 16. They were divided into 42 different groups, whereof Onsala BK could be found in Group 40 together with IL Runar, Blau-Weiß 96 Schenefeld and Älta IF Gul. Onsala BK continued to Play off A after reaching 1:st place in Group 40. In the playoff they made it to 1/16 Final, but lost it against Moss FK with 0-2. In the Final, ED Moratalaz won over SKF Latvia and became the winner of Play off A in Boys 16. Onsala BK also participated in Boys 15 during Gothia Cup 2018. They reached the 1/64 Final in B15 Play off A, but lost it against Lillestrøm SK 1 with 0-2.