Darlene Ruth Hard was an American professional tennis player, known for her aggressive volleying ability and strong serves. She captured singles titles at the French Championships in 1960 and the U.S. Championships in 1960 and 1961.

The Grand Slam in tennis is the achievement of winning all four major championships in one discipline in a calendar year. In doubles, a Grand Slam may be achieved as a team or as an individual with different partners. Winning all four major championships consecutively but not within the same calendar year is referred to as a "non-calendar-year Grand Slam", while winning the four majors at any point during the course of a career is known as a "Career Grand Slam".