Together with Wil Hartog and Boet van Dulmen, he was part of a contingent of Dutch riders who competed at the highest levels of Grand Prix racing in the late 1970s.
[1] Middelburg never earned a factory-sponsored race bike, yet managed to post some impressive results.
Middelburg became the second Dutchman to win the Dutch TT in 1980, and in 1981 he pulled off an unexpected upset when he defeated the defending world champion, Kenny Roberts at the British Grand Prix at Silverstone.
[4] Middelburg was killed while competing in a street circuit race in Tolbert, Netherlands in 1984.
[5][6] On 2 April, he lost control of his motorcycle, and was run over by Boet van Dulmen.