Rubuta ci gaba ga wannan sakin layi - Pietrzak ya yi gasa a cikin taron 4 × 400 m
a wasannin Olympics na shekara ta 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.