TOKYO (AP) — Novak Djokovic knows how close he is.
Not just to creating history and becoming the first man to achieve a Golden Slam by winning all four major tennis tournaments and an Olympic singles gold medal in the same year.
Sure, that's on Djokovic's mind as he enters the Olympic tournament starting Saturday.
But it's the bigger end product that would be the result of such an achievement that is weighing most heavily on him — surpassing Roger Federer and Rafael Nadal to be considered the greatest tennis player ever.
The goal is so great that Djokovic doesn't even want to consider the consequences.