Rafael Nadal is bracing for another titanic battle with Novak Djokovic as tennis's most abiding rivalry returns to Wimbledon's Centre Court for a blockbuster semi-final.
The grand slam heavyweights will square off for a record 52nd time on Friday night, but first time at a major since the 2016 French Open quarter-finals.
"There is no one other match in the history of tennis that played more than our match. That's a big thing," Nadal said ahead of his first last-four appearance at The All England Club since losing the title match to Djokovic seven years ago.
"We always played in important stages, important places.
"Friday is another important match against an opponent that is one of the most difficult ones that you can face. He's playing well. Only way to try to win it is play very well.
"Always is a big challenge face Novak. He's one of the more complex players that I ever saw on our sport.
"You know that you can't win against him if you don't play very well."
The resurgent Nadal has won his past two matches with Djokovic and leads the Serb 9-4 in grand slam showdowns.
But the world No.1 trails 26-25 in their careers series after Djokovic dominated with an 11-from-12 spell during his glory days between 2013 and 2016.
And while Nadal is back on top of the world after snaring an 11th French Open title last month, Djokovic believes he too is approaching his vintage best again after a turbulent two years in which he relinquished all four grand slam trophies that he once held simultaneously.
"It's feels great to be in the last four of a slam," the 12-times major winner said.
"I've been building the last couple of weeks on the level of tennis that I've played the last couple of month, the last couple of clay-court tournaments and Queen's.
"I felt like it was getting better and better as time went on. I feel like I'm peaking at the right moment."
Chasing his 18th slam, Nadal can only agree.
"I know he's playing very well," the Spaniard said.
"I saw matches of him. He's playing great."
The victor will play the winner of Friday's first semi-final between American eighth seed John Isner and South African 10th seed Kevin Anderson on Sunday for the title.