Athletics

Defining moment: Marion Jones was the golden girl and smiling face of the 2000 Olympics but instead came to represent all that was rotten in the sport when she was sentenced to six months in jail on January 11, 2008, for lying about using performance-enhancing drugs.

Jones won the 100m and 200m and ran an astonishing third leg to help the United States win the 4x400m relay in Sydney, as well as taking two bronzes, but, with former partners including convicted dopers CJ Hunter and Tim Montgomery, it was with disappointment but little surprise that the athletics world greeted the news that she too had cheated her way to glory.