Goran Prpic defeated Horst Skoff 2-6 6-3 7-6 in the Prague quarter-final on clay.
Prpic G. came through in three sets.
Goran Prpic beat Horst Skoff 2-6 6-3 7-6. Umpiry, "Goran Prpic vs Horst Skoff — Prague Quarter-final", https://umpiry.com/match/1990-08-06/prpic-vs-skoff-prague-qf?utm_source=cite (as of 6 August 1990).