I haven't been playing too long (only into my second year in-game) but something happened which made me go "WTF", lol. Here's how my slams have gone so far:
1997 AO: Pierce
1997 FO: Hingis
1997 W: Davenport
1997 USO: Novotna
1998 AO: Graf
1998 FO: Sanchez Vicario
1998 W: Rennae Stubbs She wasn't even seeded! But I guess that's the WTA for you. :p