Grace had made his first-class debut in 1865 at the age of sixteen and announced his arrival in 1866 with 224 not out for an England eleven against Surrey at the Oval. Three further seasons of consolidation followed. In 1869, however, the cricketing world saw a step change. He scored 1,320 first-class runs in 25 innings, including six centuries — at a time when six centuries in a season was a career total for most professionals. He took 73 first-class wickets bowling fast roundarm. He was the leading run-scorer for the Gentlemen against the Players in both fixtures of the year — at the Oval (he made 117) and at Lord's (138). The Players had won the previous five matches in the series; the Gentlemen now won both. Off the field, Grace was elected to the MCC in May 1869 — the first time the club had elected a player so young. The Gloucestershire county club, of which his older brother E.M. Grace was already a leading figure, was formally constituted that year with W.G. as one of its founding figures, opening the path to the family's domination of county cricket through the 1870s.