manz qualified for the men's 68 kg class at the 2008 summer olympics in beijing, after placing second from the european qualification tournament in istanbul, turkey. he defeated kyrgyzstan's rasul abduraim in the preliminary round of sixteen, before losing out the quarterfinal match to u.s. taekwondo jin mark lópez, with a score of 1–3. because his opponent advanced further into the final match, manz took advantage of the repechage round by defeating afghanistan's nesar ahmad bahave. he progressed to the bronze medal match, but narrowly lost the medal to chinese taipei's sung yu-chi, with a sudden death score of 3–4.