Ivan Vajda defeated Djalmar Sistermans 6-4 6-1 in the Central America 4 round of 32 on hard.
Vajda I. took it in straight sets.
Ivan Vajda beat Djalmar Sistermans 6-4 6-1. Umpiry, "Ivan Vajda vs Djalmar Sistermans — Central America 4 Round of 32", https://umpiry.com/match/2001-01-08/sistermans-vs-vajda-central-america-4-r32?utm_source=cite (as of 8 January 2001).