Keep in mind that "man" had been chemically (and probably surgically) castrated years before playing in the WTA. That hormone therapy would have removed most if not all of the physical advantage "he" might have possessed.
fwiw/imo - whether or not you think RR should have been allowed to play in the WTA, if this person felt so strongly that they were truly a woman trapped in a male body, that the physical form was an error, that they were willing to undergo such a radical, traumatic and even dangerous transformation, the least we can do is respect HER decision and stop referring to her as "he" or as a man. Renee Richards would probably tell you she is not a man who became a woman, but a woman who after many years was able to have her outer form reflect who she really was all along.