Filippo Grasso defeated Federico Pierini 6-2 6-1 in the Brazil 2 Masters 4 round of 16 on clay.
Grasso F. took it in straight sets.
Filippo Grasso beat Federico Pierini 6-2 6-1. Umpiry, "Filippo Grasso vs Federico Pierini — Brazil 2 Masters 4 Round of 16", https://umpiry.com/match/1991-04-15/grasso-vs-pierini-brazil-2-masters-4-r16?utm_source=cite (as of 15 April 1991).