Michael Phelps left Athens with six gold and two bronze medals. His eight total medals tied him with Soviet gymnast Alexander Dityatin for the most medals ever won by a competitor at a single Olympic Games.
Since then, Phelps has become the most decorated athlete in Olympic history. In Beijing in 2008, he broke Mark Spitz's record by winning eight gold medals. After his performance in London in 2012, he now has 22 medals, including 18 gold medals.