Bob Mathias. Bob won the decathion in the London games of 1948 at the age of 17. Four years later he became thw first person to win the decathion twice by an astounding margin of 912 points. By this time he was a student at Stanford and a star football player, in the same year he won his second decathion he led the Stanford football team to a Rose Bowl win. After graduating Stanford, he joined the marines and was promoted to the rank of captain. He also served four terms in the US House of Representatives as a Republican, representing the San Joaquin Valley of California where I'm from.