Beatriz Haddad Maia came from a set down to defeat Ons Jabeur and become the first Brazilian woman to reach the French Open semi-finals in the open era.
After battling for nearly four hours to beat Sara Sorribes Tormo in the fourth round, the 14th seed again found herself with work to do after losing the opening set to seventh seed Jabeur.
A very tight second went to a tie-break, which Haddad Maia took, and the Brazilian ran away with the decider to win 3-6 7-6 (5) 6-1.
Haddad Maia, 27, looked utterly stunned at the moment of victory, having never previously gone beyond the fourth round at a slam.
Her results away from the majors have been very impressive, though, and she will hope to follow in the footsteps of Brazilian grand slam champions Gustavo Kuerten and Maria Bueno.
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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