Piet Norval defeated Jacco Van Duyn 7-5 6-1 in the Great Britain 2 Masters 2 round of 16 on hard.
Norval P. took it in straight sets.
Piet Norval beat Jacco Van Duyn 7-5 6-1. Umpiry, "Piet Norval vs Jacco Van Duyn — Great Britain 2 Masters 2 Round of 16", https://umpiry.com/match/1991-04-22/duyn-vs-norval-great-britain-2-masters-2-r16?utm_source=cite (as of 22 April 1991).