Few will be expecting Andujar to beat Nadal today, but the wildcard doesn't see it that way. Andujar had slipped to 113 in the world before this week's Madrid Masters after enduring a miserable start to 2013, but he is having the best week of his career. He beat Marin Cilic and John Isner in the first couple of rounds before stunning Roger Federer's conqueror Kei Nishikori 6-3 7-5 in Friday's quarter-finals to make a Masters semi-final for the first time.
But Andujar is hoping he'll have the surprise factor.
"The favourite, of course, is him," he said on Friday evening.
"I do believe I have more options playing in Madrid because it's a little bit faster. And playing two sets, you cannot tell who's the worst player. You don't see it so clearly. It's true that in two sets the one who's a little bit inferior has the possibility to give the surprise."
He will also be thinking that Nadal looked a little vulnerable during his 4-6 7-6 6-0 quarter-final win over David Ferrer. Ferrer will be kicking himself after failing to put away an easy forehand when he was just two points from victory, and the world No. 5 survived to maintain his perfect record against Ferrer on clay.
It was a rather erratic display from the Spaniard, but after seeing his main rivals Novak Djokovic, Andy Murray and Federer all crash out in the past few days, he is the huge favourite to win the Madrid title for a third time this weekend.
Prediction: Nadal in two.