Novak Djokovic awaits for Monte Carlo clay king Rafael Nadal

World number one Novak Djokovic is the last man standing between king of clay Rafael Nadal and an incredible eighth straight title at the Monte Carlo Masters.

The top-ranked Serb, playing this week despite his beloved grandfather's death, has won the last seven matches with the Spanish ace -- all of them finals at major events -- but trails 14-16 in their head-to-head series.

Djokovic reached his second Monte Carlo final, having lost one to Nadal in 2009, when he overcame Tomas Berdych 4-6, 6-3, 6-2 in the semi-finals on Saturday.

Nadal kept a victory run at Monte Carlo dating to 2005 alive as he won a 41st match on the trot at the event, defeating French ninth-seeded crowd favourite Gilles Simon 6-4, 6-4.

Djokovic has improved his form after playing three matches while grieving, but is fully prepared for a battle on Sunday in the principality.

"It will be the most difficult match for me in this tournament," said Djokovic, who beat Nadal six times in 2011 and won their six-hour Australian Open final in January. "He's the player to beat here.

"He's the player to beat on clay courts. He's the best ever in history of the sport on this surface.

"It's an ultimate challenge. I need to play well from the first to the last point. I cannot have ups and downs. I cannot afford that against Rafa. I'm aware of that. But why not believe that I can win?"

Nadal, the winner of the last seven editions, and who last lost a Monte Carlo match in 2003, has gone through the week without dropping a set, even as he tested a left knee that required a fortnight of treatment earlier this month.

"We are evenly matched. We've played many, many matches against each other," said Djokovic. "We've played many finals against each other in the last 15 months.

"It's going to be an interesting match-up. I've never won this tournament. And he's won 41 matches here.

"He's definitely motivated to win another one. You always know that Rafa is going to come up with his best fight and his best tennis when he needs to.

"That's why he makes another player who plays against him come up with the best tennis, too. So that's something that I have to keep in mind."

Nadal is just pleased to be contending after his two weeks of left knee injury treatment this month.

"I have much less to lose than him, I have everything to win," said the optimistic holder. "That's the most important thing."

Nadal called his eighth concecutive final in the principality "a perfect way to start the clay court season."

"To be in the final without losing a set, it means a lot to start another clay season with a final. Now remains the most difficult thing. I am here to try."