Marshall relinquished his county duties during the 1984 tour of England. In a Test series that came to be known as the "Blackwash", the West Indians completed a 5–0 triumph, to date the only visiting team in England to have achieved such a feat. Marshall played a key role, taking the second-most wickets in the series with 24, behind only Joel Garner who took 29, and establishing his reputation as one of the finest bowlers in the world. In the series, he took five or more wickets in an innings three times, had the best bowling average - conceding only 18.20 runs per wicket, and the best strike rate - averaging one wicket every 42 deliveries.