Lightest heavyweight boxing world champion

Robert James `Bob' Fitzsimmons (1863-1917), from Helston, Cornwall, UK weighed 75 kg (165 lb), when he won the title by knocking out James J. Corbett at Carson City, Nevada, USA on 17 March 1897. The weight has since been disputed. Most records now show Fitzsimmons weight to have been 167 lb.