Billie Jean King has written a series of powerful tweets defending Serena Williams after the US open, noting that there is still too much sexism in her sport. During the final Williams discussed the penalty with the match official and repeatedly asked for an apology, and has since been fined $17,000 . King wrote that if it was a man then it would be okay for him to speak out and he would even be encouraged to do so, but Serena as a woman was just called hysterical and got punished just for expressing her disapproval. The 36-year-old who holds 23 grand slam titles, a world record, received a code violation for coaching, a penalty point for racquet abuse and a game penalty for calling the umpire a “thief”. BBC tennis presenter Sue Barker, said she had seen men arguing about a similar thing but they were not given a violation. While the governing body for the sport, the WTA (the Women’s Tennis Association), made a statement which supported Williams in her protests.