Gladys Colston
Blanche Gladys Colston, Lady Roundway was a British tennis player. She reached the third round at Wimbledon twice in 1922 and 1923, conceding walkovers in both instances. She was a runner-up at the British Covered Court Championships in 1902 and 1922, twenty years apart. She competed regularly in Germany in her early career.
Colston won a set in two 1913 finals against Suzanne Lenglen at tournaments in Wimereux and Le Touquet in northern France when Lenglen was 14 years old, making her one of the few players to win a set in multiple matches against Lenglen in singles. She defeated Lenglen in the mixed doubles finals at both of those tournaments, partnering with Triple World Champion Anthony Wilding in the latter event, making her one of the few players to defeat Lenglen in multiple matches.