i also understand the sport you participate in could make a difference as well.But are the thousands of other women performing at her level? She's arguably the greatest female athlete of all time.
I know you're not sexist or a **** poster but that's probably the difference: how good she still is.
Don't forget everyone, she's also playing doubles with Venus.
but to answer the question, no not many are/would be performing at her level. but also, 4 weeks ago her level wasnt what it was last night haha