Yuma's first opponent in the WDC is the soccer kid, Striker. Striker transforms the surrounding with his Field Spell Card "Stadium of Dreams", as the Duel kicks off. With his "Offside Trap", Striker brilliantly seals Yuma's strategies, while his teammate monsters use teamwork to frantically keep beating Yuma up with a combo of offense and defense and with such sheer strength, it seems as if Striker's victory is all but decided. Then, Caswell finally recognized Striker after his brothers are seen watching him duel, and he said that he used to like soccer, but teamwork kept messing him up, so he quit, saying he was over with soccer. Yuma said he definitely wasn't over with it, his cards said so. After Yuma beat Striker, his brothers said that he could be on the team again, which he happily accepted. Striker thanked Yuma for helping him realize the values of teamwork.