PDJ
G.O.A.T.
Navratilova, near as dammit, had a full playing schedule until she was 37 (singles & doubles). And just doubles way beyond that.Was Navratilova still having normal schedule when she's 35?
Give Serena and Roger a break, she/he wants to do part time and that's fine.
And, in fairness, how often has Williams played a full season?