Originally Posted by krosero
Seven rounds at RG would have been especially grueling for someone his age -- and Rosewall knew it. (We had a thread about this: http://tt.tennis-warehouse.com/showthread.php?t=302936
And we've only talked about 7 rounds at RG, picture also the claycourt preparations that Rosewall would have done, in practice and in tournaments, if he wanted to enter RG with the intention of winning it. It would have been draining for him.
Rosewall was a great claycourt player and his stamina is underrated but it would have been super tough for him to go with seven rounds on red clay to win the 1973 French considering he would be 39 in 1973. He probably would have gone up against a number of clay specialists. Let's say he played a young Borg in one of the early rounds. Rosewall probably would have won but Borg would have probably kept him out on the court for a long time and would have taken a lot out of him for later rounds.
An older body takes longer to recover.