|Olympic medal record|
|European Amateur Championships|
Tiedt won a silver medal for Ireland at the 1956 Summer Olympics in Melbourne, Australia in the welterweight division. Tiedt beat opponents from Poland, the United States, and Australia before losing a split decision to Nicolae Linca of Romania. The following year Tiedt won a bronze medal at the European Amateur Boxing Championships in Prague.
- Defeated Tadeusz Walasek (Poland) points
- Defeated Pearce Allen Lane (United States) points
- Defeated Kevin Hogarth (Australia) points
- Lost to Nicolae Linca (Romania) points
He turned professional in 1959 but his professional career was not as successful as his amateur career with a points victory over Al Sharpe to gain the Irish Welterweight Title the only highlight. Tiedt finished with a record of 12 wins, 7 defeats and 2 ties.
Tiedt is the uncle of Liam Mooney, a former rugby player and now an entrepreneur living in Dubai.
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