Oscar Martinez Dieguez defeated Diego Hipperdinger 6-2 6-3 in the Spain 5 Masters 1 round of 32 on clay. The upset overturned the form book — Diego Hipperdinger came in leading the head-to-head 1–0. Oscar Martinez Dieguez claimed a first win over Diego Hipperdinger in two meetings, levelling the head-to-head at 1–1.
Martinez Dieguez O. took it in straight sets.
Oscar Martinez Dieguez beat Diego Hipperdinger 6-2 6-3. Umpiry, "Oscar Martinez Dieguez vs Diego Hipperdinger — Spain 5 Masters 1 Round of 32", https://umpiry.com/match/1999-05-07/dieguez-vs-hipperdinger-spain-5-masters-1-r32?utm_source=cite (as of 7 May 1999).