It is not the first time that Williams has been fined for avoiding media obligations at a Grand Slam event. She was fined $5,000 at the 2016 Australian Open for skipping the news conference after her first-round loss.
She also was fined for skipping news conferences after a first-round loss at the 2015 French Open ($3,000) and a doubles loss in 2010 at Wimbledon ($4,000).
Williams, a five-time singles champion at the All England Club, plays Garbine Muguruza for the championship on Saturday.