Take all the big prize money from the regular tour and put it into the futures and challengers tours but leave the rankings points where they are. In other words, Federer would still have all his amazing achievements that he has made the past few years but he would probably still be living at home with his parents and driving around an old banger whenever he returned to Switzerland. The two players I will put forward are Davydenko and Nadal. However much I love Dayvdenko I dont think we would have seen him in the top 5 for so long because we all know he plays for the money and he just wouldnt be getting all that if the prize money was distributed in this way. At the other end of the spectrum I think is Nadal. I think he would still have all his achievments that he has made over the past few years even if the prize money wasnt there. I have seen in interviews where he has said that if wasnt as good as he was he would still be happy playing tennis even if it was at a challenger level if playing tennis all day was what he was able to do.