Kammala wannan jumla: Tarczynski kuma ya yi gasa a cikin
100 m baya a gasar Olympics ta 2012 a London. Ya share duka rikodin ƙasa da FINA A-yanke na 54.12 daga Gasar Wasanni ta Poland a Olsztyn. Ya kalubalanci wasu 'yan wasa bakwai a zagaye na biyar, ciki har da Camille Lacourt na Faransa da kuma Arkady Vyatchanin na Rasha, wanda ya lashe lambar tagulla a Beijing shekaru hudu da suka gabata. Tarczysnki ya adana wuri na bakwai a kan abokin aikin Lacourt Benjamin Stasiulis da kashi uku cikin goma na biyu (0.30), a cikin lokaci na 55.06. Tarczysnki ya kasa ci gaba zuwa wasan kusa da na karshe, yayin da ya sanya na ashirin da bakwai a duka a rana ta biyu na prelims.