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. In the first test at
Edgbaston, which the West Indies won by an innings and 180 runs, he ended the Test career of local
Warwickshire opener
Andy Lloyd after half an hour; he had already faced a few short deliveries from both Marshall and Garner but was then caught unawares by a delivery from Marshall that rose sharply and struck him flush on the temple behind his right eye. Lloyd soon had to retire hurt when he realized he was suffering blurred vision in his right eye and was hospitalized for several days. Lloyd would remain stranded on 10 runs without being dismissed and he never went onto play international cricket again leaving him with a unique record of being the only opening batsman in test cricket to have never been dismissed by any bowler. In the third Test at
Headingley, Marshall ran through England's batting order in the second innings to finish with 7/53, despite having broken his thumb in two different places when he attempted to field a stroke played by
Chris Broad on the first morning in the first innings. He also came out to bat at number 11 in West Indies' first innings despite his injury, allowing his team to gain a further psychological advantage as
Larry Gomes completed an unbeaten century (Marshall batted one-handed that day, with one arm in plaster). Marshall himself also contributed to the team with the bat scoring a boundary with an inside-out forehand down the line. Marshall was dismissed soon after Larry Gomes had completed the century. Even though the partnership lasted for just 16 minutes and with only 12 runs being produced, it turned out to be one of the most memorable test match partnerships for the tenth wicket. In 1984/85 Marshall had another successful series at home against
New Zealand, although there were calls for his bouncers to be ruled as intimidatory beyond what was acceptable, and that Marshall should have been admonished by the
umpires. A rising delivery broke the nose of England batsman
Mike Gatting in a one-day match in February 1986; Marshall later found bone fragments embedded in the leather of the ball. As well as the bouncer, however, Marshall succeeded in swinging the ball in both directions. He also used an in-swinging yorker as well as developing an effective leg-cutter, and with the exception of the 1986/87
New Zealanders, against whom he could only manage nine wickets at 32.11, no side seemed to have an answer to him. 1988 saw his career-best Test performance of 7–22 at Old Trafford, and he ended the series with 35 wickets in five Tests, at 12.65. Marshall was coming towards the end of his international career, moreover, and though he took 11 wickets in the match against
India at
Port of Spain the following winter, he played his last Test at
The Oval in 1991. His final Test wicket – his 376th – was that of
Graham Gooch. These efforts led him to retain the number 1 ranking in ICC Test Bowling Rankings for the year 1990 (which he attained in 1989). ==Later career==