Most heavyweight titles won by a former middleweight

According to Official Guinness Records,

This remarkable feat has been achieved only twice in 106 years. The first time was by Robert James `Bob' Fitzsimmons (UK) when he knocked out James J. Corbett (USA) at Carson City, Nevada, USA on 17 March 1897. Roy Jones Jnr (USA) matched this when he beat John Ruiz (USA) for the World Boxing Association title by unanimous decision on 2 March 2003 at Las Vegas, Nevada, USA.

For a complete list of 2003 records, please visit 2003 Guinness Records in United States.

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