Wilfred Benitez is the youngest (male) world champion in boxing history, capturing the WBA junior welterweight title at the age of 17 years and 5 months with a split decision over Antonio Cervantes. He went on to win the WBC welterweight title as well as the WBC light middleweight title. = =
When he was 15 Ian Thorpe won the 400 meter freestyle at the world championships. This made him the youngest male swimming world champion ever.
The youngest WWE Intercontinental Champion was Jeff Hardy. He was 23 years, 222 days.
Tajamul Islam- is the Youngest Kickboxing Champion.
Seve Ballesteros, 1980 and 1983 Champion.
Sebastian Vettel is the youngest driver to win the formula 1 drivers champion. He was 23 years and 134 days old.
It is Mike Tyson when he was fighting with Trevor Berbick He became the youngest heavyweight champion in history.
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