Obviously Nadal won't retire. In my personal opinion, If rafael nadal calls it quits due to injury, he should be considered greatest of all time. To put in perspective what he has done-he would be only 23 years old with 5 majors. Thats HARD. Nadal at 23 has had the best career until 23 years old. You see, if Nadal cant play 100 percent he shouldnt continue his career especially with a Knee, an injury that can be tweaked very easily especially moving laterally. Nadal has to be the greatest of all time if he retires. Theres no other way to put it. I am Roger Federer's greatest fan and will hold him high forever, but whenever you break everything down, Nadal HAS TO BE goat if he retires early. Nadal has been that dominant, and that kind of player. If Nadal wins US OPEN and retires, theres no question about it. Nadal deserves a lot of praise for what hes done thus far. I dont think many people put it into perspective what Nadal has done so far. Its amazing.