Maria Sakkari fought off a Coco Gauff fightback to book a place in the final of the BNP Paribas Open at Indian Wells.
She will face top seed Iga Swiatek after beating the American third seed 6-4 6-7 (5) 6-2 in a lengthy, rain-interrupted battle which finished after 1am.
Gauff broke the Greek ninth seed early, but Sakkari fought back to take a first set interrupted by a short rain delay 6-4.
A lengthy break for the weather delayed the start of the second set, Sakkari settling quickest on the resumption and breaking the American twice to lead 5-2.
But she could not serve out the match, despite having a match point, as Gauff broke back and took the set on the tie break.
Gauff broke again at the start of the third set, but Sakkari dug in and rattled off four games in a row to take control again.
And this time she was able to complete the job, breaking Gauff again to complete the win after two hours, 41 minutes on court.
Swiatek’s path to the final, in which she has lost just 20 games, was more straightforward as she saw off Martya Kostyuk 6-2 6-1.
The world number one needed little more than an hour to see off the 31st seed without facing a break point.
Keys downs Gauff to reach Madrid Open quarter-finals
Madison Keys is through to the quarter-final of the Madrid Open for the first time in her career after rallying to a 7-6 (7-4), 4-6, 6-4 win over Coco Gauff on Monday.
The 29-year-old trailed 5-2 in the first set and 4-2 in the third set but rallied in both to come from behind to beat the number three seed.
Despite winning the second set, Gauff struggled to find her rhythm, suffering from 13 double faults, including two in the final game.
Keys will face former Madrid Open champion Ons Jabeur for a spot in the semi-final after the number eight seed overcame Jelena Ostapenko in straight sets.
Data debrief: Keys reaches new milestone
Having lost in the first round in seven of her nine previous trips to the Spanish capital, Keys has now bettered her previous best finish in Madrid - a third-round showing in 2016.
Keys hadn't won three matches in a row since reaching the US Open semifinals last year.
Keys downs Gauff to reach Madrid quarter-finals
Madison Keys is through to the quarter-final of the Madrid Open for the first time in her career after rallying to a 7-6 (7-4), 4-6, 6-4 win over Coco Gauff on Monday.
The 29-year-old trailed 5-2 in the first set and 4-2 in the third set but rallied in both to come from behind to beat the number three seed.
Despite winning the second set, Gauff struggled to find her rhythm, suffering from 13 double faults, including two in the final game.
Keys will face former Madrid Open champion Ons Jabeur for a spot in the semi-final after the number eight seed overcame Jelena Ostapenko in straight sets.
Data debrief: Keys reaches new milestone
Having lost in the first round in seven of her nine previous trips to the Spanish capital, Keys has now bettered her previous best finish in Madrid - a third-round showing in 2016.
Keys hadn't won three matches in a row since reaching the US Open semifinals last year.
Nadal goes the distance to reach Madrid Open last 16
Rafael Nadal battled to victory over three hours on the court against Pedro Cachin at the Madrid Open on Monday to seal a 6-1 6-7 (5-7) 6-3 win to reach the last 16.
The former world number one looked back to his best as he cruised through the opening set but was pushed hard in the second by Cachin.
Nadal came from behind to level at 5-5, but Cachin eventually sealed the set on his third set point.
The Spaniard then rallied in the third set, cutting down on his errors to regain control and advance to the fourth round at a tour-level event for the first time since 2022.
Nadal is one step away from booking his place in a 10th consecutive quarter-final in Madrid and will face Jiri Lehecka on Tuesday in the next round after the 30th seed overcame Brazilian qualifier Thiago Monteiro in two sets.
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