Playing career
John Colin Gregory was born in Beverley, Yorkshire, on 28 July 1903, the son of Dr William Herbert Gregory and his wife Constance, and like his father became a doctor. He also played cricket, golf, rugby and squash. He played Davis Cup for Britain from 1926 to 1930, reached the Wimbledon singles quarter-finals in 1926 and 1930 and the French quarter-finals in 1930.
In January 1929 he won the Australian Championships at Memorial Drive, Adelaide, as fourth seed, beating Richard Schlesinger 6-2, 6-2, 5-7, 7-5 in the final. That summer he was seeded eighth at Wimbledon, the first Englishman seeded in the gentlemen's singles, and lost in the fourth round; with the Scot Ian Collins he reached the doubles final. He also won the Scottish Championships that year, beating Collins in the final, and in 1931 the Kent Championships at Beckenham.
From 1934 he practised medicine in Hemel Hempstead. He captained the British Davis Cup team from 1949 to 1952, and in 1952, at 48, came in as an injury replacement to win a doubles rubber against Yugoslavia with Tony Mottram. He became vice-chairman of the All England Club in 1953 and its Chairman in 1955, and also chaired the All England Lawn Tennis Ground Company. He died at the club on 10 January 1959, aged 55, collapsing in the changing rooms after a match.
On grass
Every grass title: 3
Show every title, tournament by tournament
Leading grass titles only: the grass majors, tour-level grass events since 1968 and the leading grass championships before 1968. †single source; ‡ sources disagree. Roll of champions