Cika wannan jumla: Pietrzak ya yi gasa a cikin
Gasar tseren mita 4 × 400 a wasannin Olympics na bazara na 2012 a London. A Gasar Zakarun Turai ta 2013 a Gothenburg, tawagarsa ta rasa lambar tagulla ta relay saboda rashin cancanta; an yanke hukunci cewa daya daga cikin abokan wasansa ya tura dan wasan Burtaniya Richard Buck.