HighThief, yes, you are talking about Rene Richards.
She is a ophthalmologist who had a practice in NYC. As a guy she was a competitive player in local tournaments. After transition she moved to California and tried to live a low profile life. Someone spotted her playing tennis with a friend and recognized that she had that aggressive killer instinct that makes a good tournament player. After being hectored for some time she gave in and entered a tournament. She did well.
Someone told a news reporter about her background which produced an insane media frenzy. After she was disqualified from competing in women's tennis she had to fight in court to be recognized as a woman and be allowed to compete.
She was not competing with "muscle mass" as you say, though. At her best she was apparently good enough to go pro, if not to reach the very top level of competition.
The golfer is probably Mianne Bagger. She is a ranked golfer who plays mostly on the Lady's European Tour and the Australian women's golf circuit. I do not know much about her but she has a web page and blog at
Mianne Bagger - Main.
MadMabel