Russia's Anastasia Pavlyuchenkova finally reached a Grand Slam semifinal at the 52nd time of asking.
She defeated Kazakhstan's Elena Rybakina 6-7(2) 6-2 9-7 at the French Open on Tuesday.
Six times the 29-year-old had lost at the quarter-final stage of one of the four majors, but she used all her experience to overcome her doubles partner in a gruelling encounter.
Rybakina, 21, looked in control of her first Grand Slam quarter-final when she opened up a 4-1 lead in the first set but Pavlyuchenkova hit back to force a tiebreak.
Pavlyuchenkova took the momentum into the second set to level the match and kept her nose ahead in a tense finale.
Rybakina, who beat Serena Williams in the fourth round, held serve three times to stay alive in the third set.
But she failed at the fourth time of asking, ending the contest in tame fashion with a double-fault.
Pavlyuchenkova will face fellow semi-final debutant Tamara Zidansek for a place in Saturday's final after the Slovenian also came through a long battle, against Paula Badosa (7-5 4-6 8-6).


Baptiste's variety drags Sabalenka out of comfort zone in Madrid shock
FIFA to increase financial distribution to all 48 World Cup teams by 15%
Sabalenka stunned by Baptiste in Madrid Open quarter-finals
Palestinian football body appeals to sports court over FIFA Israel ruling
Holders PSG edge Bayern 5-4 in record-breaking semi-final first leg
