Grand Slam (tennis) four players (Agassi, Federer, Nadal, Djokovic) achieved their career grand slam on three different surfaces: hard court, clay, and grass. Each woman's "first wins" in the four majors are listed chronologically and their ages upon completion of the Career Grand Slam are given in brackets. Five of the ten women achieved at least two Career Grand Slams, two of the ten have achieved three Career Grand Slams and Steffi Graf is the only player to achieve four Career Grand Slams. At Men's Doubles, 21 players have won the Career Grand Slam, including fourteen who achieved the Career Grand Slam with
International Tennis Federation ITF organizes the Grand Slam events, annual team competitions for men (Davis Cup), women (Fed Cup), and mixed teams (Hopman Cup), as well as tennis and wheelchair tennis events at the Summer Olympic and Paralympic Games on behalf of the International Olympic Committee. The ITF sanctions the Grand Slam tennis tournaments as well as circuits which span age ranges (junior, professional men and women, and seniors) as well as disciplines (wheelchair tennis; beach tennis). In addition to these circuits, the ITF also maintains rankings for juniors, seniors, wheelchair and beach tennis. Duane Williams, an American who lived in Switzerland, is