While Richard was accused of fixing matches between Serena and Venus, Serena had her own pitfalls to deal with over the years. There were multiple instances in which she got into verbal blows with tennis umpires. One such incident occurred in the 2009 U.S. Open during which Serena threw her racket down on the court out of anger. She was fined $10,500 for unsportsmanlike behavior when she spewed profanities at a lineswoman on the court.
Serena was reported to have told the umpire she would take a tennis ball and shove it down her throat. And, Serena said at the time, she had followed the rules on the court.
“An apology from me?” She said after the incident. “How many people yell at linespeople? I see it happening all the time. I don’t know how many times I have seen that happen. I am a professional. I’m not the beggar, like, ‘Please, please, please, let me have another chance,’ because it was the rules and I play by the rules.”
Source : https://www.distractify.com/p/serena-williams-cheating