Blair was born in Romford in the east of London and started playing tennis aged 11.

She was the 1935 national schoolgirls' champion and in 1936 was runner-up in a junior Wimbledon tournament.

[1] A regular competitor at Wimbledon during the 1940s, Blair twice reached the women's doubles semi-finals.

Her best performance in singles came at the 1949 Wimbledon Championships, where she beat French Open champion Nelly Landry en route to the quarter-finals.

In the 1948 Wightman Cup she earned plaudits for her performance in a surprise doubles win, partnering Jean Bostock against Doris Hart and Patricia Todd, which broke a long sequence of Wightman Cup match losses for the British.