Here are the 16 tournaments that Mary Pierce has won:

Palermo (1991, 1992)
Cesena (1992)
San Juan (1992)
Filderstadt (1993)
Australian Open (1995)
Tokyo (1995)
Rome (1997)
Hopman Cup (1998)
Paris (1998)
Amelia Island (1998)
Kremlin Cup (1998)
Luxembour (1998)
Linz (1999)
Hilton Head (2000)
French Open (2000)