He started out in the shot put and was the bronze medallist at the European Youth Olympic Festival in 1993. He just missed out on a discus medal at the 1994 World Junior Championships in Athletics, placing fourth, but he topped the podium at the 1995 European Athletics Junior Championships the following year. He followed this up with a gold medal at the 1997 European Athletics U23 Championships.
He cleared sixty metres for the first time in 1998, setting a season's best mark of 61.96 m in Sopot, but did not manage the feat at the 1998 European Athletics Championships, where he was eliminated in the qualifying round. He made his first senior appearance at world level at the 1999 World Championships in Athletics, but was also knocked out in the first round.
His next major performance after this came at the 2001 European Cup Winter Throwing event where he claimed the discus silver medal. His 2003 season brought further honours in the form of a silver at the Summer Universiade and also a bronze at that year's European Cup. In 2005 he came sixth in the 2005 European Cup, but threw his career best of 65.56 m the next month in Norrtälje. He gained entry into the 2005 World Championships in Athletics and reached the final round, ending the competition in twelfth with a best throw of 62.71 m. The final major tournament of his career was the 2006 European Athletics Championships, at which he was tenth in the final. He stopped competing professionally in 2008. He became a six-time national champion in the discus event.
- European Youth Olympic Festival. GBR Athletics. Retrieved on 2011-02-08.
- 1994 World Junior Championships. WJAH. Retrieved on 2011-02-08.
- 1995 European Junior Championships. WJAH. Retrieved on 2011-02-08.
- European U23 Championships. GBR Athletics. Retrieved on 2011-02-08.
- Krawczyk Andrzej. IAAF. Retrieved on 2011-02-08.
- European Cup Winter Throwing. GBR Athletics. Retrieved on 2011-02-08.
- Summer Universiade. GBR Athletics. Retrieved on 2011-02-08.
- European Cup. GBR Athletics. Retrieved on 2011-02-08.
- Polish Championships. GBR Athletics. Retrieved on 2011-02-08.
- Rozum, Janusz (2011-02-08). Mixing success with injury par for the course for Malachowski. IAAF. Retrieved on 2011-02-08.