Mark Joachim defeated Michael Van Der Berg 6-4 6-4 in the Hungary Masters 4 qualifying round on clay.
Joachim M. took it in straight sets.
Mark Joachim beat Michael Van Der Berg 6-4 6-4. Umpiry, "Mark Joachim vs Michael Van Der Berg — Hungary Masters 4 Qualifying Round", https://umpiry.com/match/1991-06-03/berg-vs-joachim-hungary-masters-4-qf?utm_source=cite (as of 3 June 1991).