Serena doesn't compete against the best humans tho. She only competes against other women. If you are honest about where she ranks amongst all tennis players then you'd have to admit that she's not one of the best ever when include make tennis players. You may not like it and u may hurt your feelings, but it's the truth.
Then according to you the only way for a female athlete to prove that she is indeed an elite athlete is to compete against men? Do you not see how genetically that is problematic?