has retired: http://www.bbc.co.uk/sport/0/boxing/22367564

His pro career was a washout but will history remember him as an Olympic Gold Medalist or a bit of a turkey? I remember the fanfare of his first pro fight on BBC1 (who had him signed to a big money deal), in fact I recorded it and kept the tape in case he ever became really good.

Other examples of athletes whose career just didn't pan out as well as it was supposed to are most welcome.