Martin Blackman defeated Christoph Sieber 6-2 6-3 in the Caribbean 2 Masters 1 round of 32 on hard.
Blackman M. took it in straight sets.
Martin Blackman beat Christoph Sieber 6-2 6-3. Umpiry, "Martin Blackman vs Christoph Sieber — Caribbean 2 Masters 1 Round of 32", https://umpiry.com/match/1991-04-28/blackman-vs-sieber-caribbean-2-masters-1-r32?utm_source=cite (as of 28 April 1991).