Michael Robertson defeated Mario Rincon 6-4 6-3 in the USA 1 Masters 3 round of 64 on clay.
Robertson M. took it in straight sets.
Michael Robertson beat Mario Rincon 6-4 6-3. Umpiry, "Michael Robertson vs Mario Rincon — USA 1 Masters 3 Round of 64", https://umpiry.com/match/1991-03-22/rincon-vs-robertson-usa-1-masters-3-r64?utm_source=cite (as of 22 March 1991).