okay - back from pub and drunk but that is when i get my best ideas. the most overrated sportsman is somebody who people think is great but you only think is good etc.
(1) Muhammad Ali - a very good boxer. however some think he was the greatest sportsman ever when all boxing fans know ray robinson was best boxer and I believe joe louis is the best heavyweight
(2) rocky marciano - coincidently also a boxer. retired undefeateed champion but defended against old men like joe louis, jersey joe walcott etc.
(3) david beckham - a good footballer but probably not as good as peter beardsley (no where near barnes) but good looking, married famous women and lived for publicity.
(4) anna kournikova - media made out she was really good, not quite steffi graff but still very good. reality, she was just a working professional standard (think the brother of andrew murray, professional level but no more).