David Caballero defeated Vladimir Voltchkov 6-4 6-4 in the Germany F2 round of 16 on clay.
Caballero D. took it in straight sets.
David Caballero beat Vladimir Voltchkov 6-4 6-4. Umpiry, "David Caballero vs Vladimir Voltchkov — Germany F2 Round of 16", https://umpiry.com/match/1999-05-12/caballero-vs-voltchkov-germany-f2-r16?utm_source=cite (as of 12 May 1999).