Players who held all four Grand Slam titles simultaneously (in a calendar year).
Players who held all four Grand Slam titles simultaneously (not in a calendar year).
Players who won all four Grand Slam titles and the Paralympic gold medal over the course of their careers.
Players who won all four Grand Slam titles, the Paralympic gold medal and the year-end championship over the course of their careers.
Players who won Grand Slam titles on clay, grass and hard courts in a calendar year.