Ivan Lendl advanced when Mark Koevermans retired 7-5 3-0 in the Estoril round of 32.
Lendl I. advanced when Koevermans M. retired.
Lendl I. and Koevermans M. faced 1 of the same opponent in the last 12 months. Lendl I. went 1–0 (100%) against them, Koevermans M. 0–1 (0%).
Only 1 common opponent — too few for any conclusion. Shown without assessment.
Ivan Lendl beat Mark Koevermans 7-5 3-0 after Mark Koevermans retired. Umpiry, "Ivan Lendl vs Mark Koevermans — Estoril Round of 32", https://umpiry.com/match/1992-03-30/koevermans-vs-lendl-estoril-r32?utm_source=cite (as of 30 March 1992).