Michael Robertson advanced past Harald Digel via walkover in the USA 1 Masters 2 round of 16.
Robertson M. advanced on a walkover.
Michael Robertson advanced when Harald Digel withdrew. Umpiry, "Michael Robertson vs Harald Digel — USA 1 Masters 2 Round of 16", https://umpiry.com/match/1991-03-22/digel-vs-robertson-usa-1-masters-2-r16?utm_source=cite (as of 22 March 1991).