Yui Kamiji is a Japanese professional wheelchair tennis player. She has won 28 major titles, as well as a Paralympic silver and bronze medal in singles and doubles, respectively, at the 2020 Tokyo Paralympics. She also won a bronze medal in singles at the 2016 Rio Paralympics.

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".