Guy made nearly 600 first team appearances for Wimbledon between 1967 and 1978. He was signed from local rivals Tooting & Mitcham United who had taken him on as a junior from Millwall. During his Wimbledon career, he once made 275 consecutive appearances, and only missed a single game in a run of 449 consecutive matches between January 1970 and August 1977.
Guy shot to national fame during the then non-league club's spectacular 1975 FA Cup run, initially keeping a clean sheet as the Dons knocked out First Division Burnley at Turf Moor in the third round, thus becoming the first non-league club in a century to beat a First Division team on their own ground. But it was in the fourth round that Guy became a Dons legend, with a heroic display at Elland Road, not only keeping another clean sheet but, most famously, saving a Peter Lorimer penalty to earn Wimbledon a replay against reigning English Champions, Leeds United. In the replay, he was again superb and was eventually only beaten by a single deflected own goal.
When Wimbledon were elected to The Football League in 1977, he made a total of 19 appearances for the club before deciding that he wished to remain a semi-professional player, rather than give up his successful career outside football. His final game for Wimbledon was at Plough Lane against Torquay United on 21 February 1978. At the end of the season, in recognition of his devoted service to the club he was awarded a testimonial match against Chelsea on 11 April 1978.
He moved to Maidstone United after leaving Wimbledon and played in their F.A. Cup tie against Charlton Athletic at The Valley, which saw two Charlton players (Mike Flanagan and Derek Hales) sent off for fighting each other. The match ended in a 1–1 draw. Maidstone lost the replay 2–1.
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