Rafael Nadal was physically hampered by a knee injury but dug deep to defeat Karen Khachanov and set up a dream semi-final with Roger Federer at the BNP Paribas Open in Indian Wells on Friday.
The Spaniard was given a tough workout by the world No 13 and was forced to battle through the pain barrier to complete a 7-6 (7-2) 7-6 (7-2) victory.
After winning a tight opening set, Nadal was forced into taking an injury time-out early in the second with tape applied under his right knee. But he shortened the points and came through another tie-breaker to complete a resilient win after two hours and 16 minutes.
Assuming he does take to the court, Nadal will face his great rival for a 39th time. He told Amazon Prime: "I had some troubles with the knee. It was some tough moments but I was able to fight and finally find a way.
"Hopefully I will be ready (for the semi-finals), I'm going to try my best to recover and play one of these matches that I want to play."
Federer stayed on course for a record sixth Indian Wells title after recording a 6-4 6-4 victory against Hubert Hurkacz.
The Pole defeated Canadian teenager Denis Shapovalov to reach his first Masters 1000 quarter-final, but 37-year-old Federer enjoyed the first career meeting with Hurkacz, who is 15 years his junior, giving him a schooling en route to victory in 73 minutes.
"Roger was playing great in the crucial moments. Today was a great lesson for me," Hurkacz said. "I had some small chances, so also give me motivation to work and to get there sometime."
Federer has not dropped a set in four matches in the desert and has been broken just once. He fought off two break points in the second set, including the last game when he closed the match with a forehand winner off a short ball to reach his 12th semi-final in the desert.
Nadal leads Federer 23-15 in meetings but the Swiss has won the past five encounters.
They have not met since Shanghai in 2017, the same year that Federer crushed Nadal in the fourth round at Indian Wells.
Federer warned fans not to read too much into his winning streak against Nadal.
"I lot has happened in the past 18 months," he said. "You can't just copy and paste and play exactly the same thing again. "It's been quite a journey with Rafa side by side."
The other semi-final will see Austrian seventh seed Dominic Thiem tackle Canadian 13th seed Milos Raonic.
In the women's semi-finals, Canadian teenager Bianca Andreescu became the youngest player to reach the final at Indian Wells in 20 years after the teenager beat Elina Svitolina of Ukraine 6-3 2-6 6-4.
"This past week, its been a dream come true playing in front of these amazing crowds," Andreescu said in a courtside interview after putting her name alongside Serena Williams who reached and won the 1999 final at 17.
"Today, I believed in myself playing against these top players. I've watched them play so many times on TV so its so incredible to play against them and win."
Andreescu, 18, will face three-time Grand Slam champion Angelique Kerber in the title match after the German beat Belinda Bencic 6-4 6-2.
"I was trying to focus only on my side of the court. I was trying to play concentrated, and going for it when I had the chance, Kerber said. "I'm really happy to be in the final for the first time now."
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