br br Serena Jameka Williams (born September 26, 1981) is an American tennis player, currently ranked world no. 1, who has won 18 Grand Slam titles: 9 singles, 7 doubles along with her sister, 2 mixed doubles and two Olympic gold medals in women's doubles. She is the most recent player, male or female, to have held all four Grand Slam singles titles simultaneously. In 2005, Tennis magazine ranked her as the 17th-best player of the preceding forty years. She is the younger sister of a former World No. 1 professional female tennis player, Venus Williams. Australia Open French Open Us Open Italian Open Rogers and AT&T Cup NASDAQ-100 Open Italian Open estyle.