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John Peerens was on the Belgian national team in the 1978 Amateur World Series, their first Amateur World Series. He was 0-1 with a 10.13 ERA and .397 opponent average, while going 1 for 8 as the backup to Walter Koeck at first base. He tied Marc Arnouts for the team lead in games pitched (3) and his 16 IP were second to Arnouts; his ERA was better than the team mark of 11.70.
He was with the Belgian squad that won the Bronze Medal in the 1983 European Championship. After his playing career ended, he worked as a coach and manager for the Brasschaat Braves, sometimes on the same staff as his son, Johnny Peerens (who also played for the national team).