Serena Williams has won 21 Grand Slam singles titles, putting her third on the all-time list. She has been ranked No. 1 in the world six times and is the oldest No. 1 player in WTA history. Williams is also the most recent player, male or female, to hold all four major singles titles at the same time.
UFC fighter Ronda Rousey, the women's bantamweight champion, has never lost in mixed martial arts, and she holds the UFC record for quickest finish in a title fight: 14 seconds. Rousey also won a bronze medal in judo at the 2008 Summer Olympics.
Jennifer Welter, a veteran player on professional women's football teams, became the National Football League's first female coach when she was hired as a training camp and preseason intern for the Arizona Cardinals in 2015. Welter is also the first woman to coach in a men's professional football league, having been named a coach for the Indoor Football League's Texas Revolution.