A right-handed batsman and occasional off-spinner, Greenstock appeared only seven times in first-class cricket, but these matches spanned a period of well over thirty years.
He appeared twice more for the university the following season, making what was to prove his career-best innings of 49 against CI Thornton's XI.
[1] Twelve years after graduating, Greenstock reappeared in the first-class game in 1899 when he appeared twice for Worcestershire, who were in their first season of county cricket.
Recalled for a match against Somerset in August 1914, he was bowled for 1 in the first innings and not required to bat in the second; again he was dropped and World War I put paid to any chance of a speedy return to the side.
His nephews Christopher and Peter also had short first-class careers, while his son John played for Worcestershire in the 1920s.