What I found and nothing is pretty much the same, but anyway.
July/98 - Yugoslávia vs. Portugal - 2/3. QF's, clay, outdoors. and that would be all.
but you know, Melvins has a website about Portuguese tennis. I don't really have the time now cause I'm working and a bit busy, sorry, but in his signature he has a link to it. Maybe he has something more there.