Filip Dewulf defeated Mario Carnevale 6-1 6-2 in the Spain 5 Masters 3 qualifying round on clay. The upset overturned the form book — Mario Carnevale came in leading the head-to-head 1–0, but Filip Dewulf had been the form player, winning 4 of their last 8 on clay. Filip Dewulf claimed a first win over Mario Carnevale in two meetings, levelling the head-to-head at 1–1.
Dewulf F. took it in straight sets.
Filip Dewulf beat Mario Carnevale 6-1 6-2. Umpiry, "Filip Dewulf vs Mario Carnevale — Spain 5 Masters 3 Qualifying Round", https://umpiry.com/match/1991-05-20/carnevale-vs-dewulf-spain-5-masters-3-qf?utm_source=cite (as of 20 May 1991).