Klaas Justus de Vries
De Vries studied at the  (HTS). He started playing with FC Harlingen. He became champion with the team in 1974. In 1980 he signed a contract with SC Heerenveen. Becoming a prosessional player he didn't play the first months as good as expected; but showed improvements. In 1980 he also played for young SC Heerenveen. His one-year contract was prelonged and played a three seasons for SC Heerenveen. He played played 37 matches for the team and scored a total of 37 goals. He scored his first goal on 30 August 1981 in the match against FC Volendam. They lost the match however with 3-2. In that season he made a total of four goals. He scored his last goal a year later on 28 August 1982 in the match against Telstar and won the match with 3-1. In July 1983 he moved to amateur club Robur Harlingen in 1983.