Rubuta ci gaba don wannan sakin layi - Diener ya lashe lambar yabo ta farko ta kasa da kasa a gasar zakarun Turai ta 2010 a tseren mita 50 a baya. Shekara guda bayan haka, a cikin 2011, ya kare lambar zinaren sa kuma ya ci nasara a tseren mita 100 da 200 a gasar zakarun Turai ta matasa a Belgrade (Serbia) kuma ya lashe lambar zinare a gasar zakarun duniya ta matasa a Lima (Peru) a tseren mita 50 a baya. Christian Diener ya lashe azurfa a 50m baya a gasar zakarun Turai na Short Course 2013 da 2014 a gasar zakarun Turai na Aquatics
Ka yi haƙuri. Ya kasance memba na ƙungiyar Jamus a Wasannin Olympics na bazara na 2016 a Rio de Janeiro kuma ya yi gasa a tseren mita 200 a baya, inda ya gama na 7.