Before starting the professional career, in 2000, Plawgo won the gold medal at the World Junior Championships in Santiago de Chile and finished third with his colleagues from the 4x400 meters relay. Several months later in Osaka, the 19-year-old Pole gained a great time of 48.16s and broke the national record of Paweł Januszewski (48.17s.). The achievement was repeated by Plawgo in the semi-final of the 2004 Summer Olympics in Athens.
