Spain still leads, 2-1, heading into Sunday's reverse singles matches.
The match will be decided today with reverse singles and doubles matches.
If neither country sweeps the first three matches, then the outcome will hinge on Sunday's reverse singles.
Nalbandian's victory guaranteed that this final would not be decided until the reverse singles on Sunday.
For Australia to win, it needs one victory in Sunday's reverse singles.
After losing a meaningless reverse singles match the next day, Rafter publicly admitted he hadn't sobered up until the third set.
Doubles play is scheduled for today, with reverse singles on tap tomorrow.
Australia then went on to win the reverse singles making statement with a 5-0 victory over Belarus.
After a five and a half hour rain delay, the reverse singles finally got under way, before being suspended midway through the first set.
A doubles match is to be played Saturday, followed by the two reverse singles matches Sunday.