Though she excelled in a number of sports, the badminton court was where Marjory Shedd truly made her mark. Throughout the 1950s and '60s, Shedd dominated Canadian badminton championships and made her presence felt on the international badminton scene. Shedd grew up a "regular tomboy," playing hockey, softball, and rugby with her three older brothers and her sports-minded father. A stand-out basketball player at her Toronto high school, she led the Carltonettes to the Canadian junior basketball title in 1945 and won the national senior basketball championship with the Montgomery Maids in 1948. In 1949, Shedd took up badminton and in 1950 she joined the Carlton Club, claiming that "they had the best name players." She reached the national badminton finals in both 1951 and 1952 and claimed her first ladies singles title the following year. Over the next two decades, Shedd collected 21 Canadian badminton titles, including six singles, four mixed, and eleven ladies doubles championships. She was six times a member of the Canadian Uber Cup team, emblematic of the major women's international badminton team competition. She was a semi-finalist at the All-England tournament, which was considered to be the unofficial world championship of badminton. In addition, she was chosen to represent Canada in mixed doubles competition at the 1970 Commonwealth Games. While ascending to these great heights in Canadian badminton, Shedd also made an impact on the Canadian volleyball world in the mid-1950s. With her University of Toronto teams, she won five Canadian titles and was chosen to join Canada's representative team at the 1967 Pan-American Games. After retiring from competition, Shedd became a member of the University of Toronto's Department of Athletics and Physical Education where she coached teams in all three of her sports. Shedd's coaching made a particular impact on the university's badminton teams. She led the women's badminton Blues to seven gold and seven silver medals in Ontario Women's Interuniversity Athletic Association competition, and she also assisted the men's teams as they dominated badminton competition in Ontario Universities Athletic Association competition, claiming ten gold medals in 15 years.