I thought this was more about players who were at the top but then fell off despite still playing. Thats why I mentioned Duval. I would not put guys like Barry Sanders or Jim Brown in this category. They were both great right up until they retired. Of course once a player retires, he will somewhat disappear from the limelight. Even Tom Watson I would not consider as someone who disappeared. He was still winning tournaments on PGA tour in his late 40's before he went on to have a nice career on Senior tour. Duval was in his prime and #1 in the world early in his career and then disappeared for years...