In recent years, Williams has shown an ability to serve aces at critical moments.
One of these instances was the 2013 French Open final, where in the last game of the match, she fired three aces, including one which clocked at 123 mph (198 km/h) on match point.
Another improbable win occurred in the third round of the 2015 Wimbledon Championships, when she recovered from two breaks of service in the third set to defeat Great Britain's number-one female player, Heather Watson.
She repeated the feat similarly against Angelique Kerber in the finals of the 2016 Wimbledon Championships to tie the Open Era record for Grand Slam singles titles.
Williams fired three un-returnable serves in her final service game before winning the match and the title with a casual forehand volley on the next point.
Experiences of racism also drove this experience, as Richard Williams had heard white parents talk about the Williams sisters in a derogatory manner during tournaments.
In 1995, when Williams was in the ninth grade, her father pulled his daughters out of Macci's academy and, from then on, took over all coaching at their home.