Matias Oneille defeated Rafael Serpa Guinazu 6-4 7-6 in the Argentina 1 round of 16 on clay. The result followed the form book — Matias Oneille came in leading the head-to-head 2–0. Matias Oneille extended the head-to-head to 3–0.
Oneille M. took it in straight sets.
Matias Oneille beat Rafael Serpa Guinazu 6-4 7-6(3). Umpiry, "Matias Oneille vs Rafael Serpa Guinazu — Argentina 1 Round of 16", https://umpiry.com/match/2000-06-12/guinazu-vs-oneille-argentina-1-r16?utm_source=cite (as of 12 June 2000).