WARNING: This page is about a different car, the 2007 Suzuki Reno, 2007 Suzuki Forenza, 2006 Suzuki Reno, and 2006 Suzuki Forenza. However, it is still accessible from the selected car via links, so may be relevant.
Check for a worn diaphragm spring finger.
Check for a worn or cracked pressure plate surface.
Check for the polluted face by the oil. After inspection, replace the pressure plate if necessary.