[citation needed] On 19 August 2008, he won an Olympic silver medal in discus throw (67.82 m) placing behind Gerd Kanter (68.82 m).

With an injured finger, Małachowski took a silver medal (69.15 m - NR) at 2009 World Championships in Berlin.

In 2010, he took victory in Golden Gala, IAAF Diamond League (68.78 m), beating second-placed Gerd Kanter (67.69 m), and another win in British Grand Prix (69.83 m - NR).

On 13 August 2016, Małachowski won his second Olympic silver (67.55 m), being surprisingly beaten by German Christoph Harting (68.37 m - PB).

He announced shortly afterwards that he would sell his Olympic silver medal to raise funds for a 3-year-old boy with a rare form of cancer.