It's one of the toughest tests in sport - Nadal on clay! Is Wawrinka up to it? Here's how you can watch.
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Nadal is aiming for his 55th career title and he'll be cheered on by a raucously partisan crowd in the Caja Magica. It seems a little unfair on Wawrinka who really needs all the support he can get but the home fans are desperate to see a Spanish champion for the first time since Nadal's win in 2010.
Nadal certainly looked like a champion in-waiting on Saturday afternoon as he pulverised poor old Pablo Andujar 6-0, 6-4. Having played so well all week, Andujar got a bad case of stage fright in his first Masters semi-final and didn't really turn up for the first half-hour.
Wawrinka's epic with Tomas Berdych could hardly have been more different. The Swiss was on the way out at 4-2 in the decider but he never stopped believing and brought his A game to the party to clinch a dramatic victory as Berdych crumbled under the pressure.
There will be plenty of neutrals who would love to see Wawrinka win. The Swiss last made a Masters final on the clay of Rome back in 2008, losing to Novak Djokovic and this week's run will put him back in the top ten but he's lost all eight of his career matches against Nadal without even managing as much as a set.
Ominously, three of those encounters have been on clay.