Veronika Kudermetova came from behind to defeat Madison Keys and set up a French Open quarter-final against fellow Russian Daria Kasatkina.
Russian 29th seed Kudermetova, 25, beat American 22nd seed Keys 1-6 6-3 6-1 to reach the last eight at a Grand Slam for the first time.
World number 20 Kasatkina recorded a straight-set win over Camila Giorgi.
Kasatkina won 6-2 6-2 against Italy's 28th seed to reach her first quarter-final at Roland Garros since 2018.
The 25-year-old has been in ruthless form at Roland Garros and is yet to lose a set after four matches.
Compatriot Kudermetova, who beat injured third seed Paula Badosa in the previous round, recorded another fine victory in Paris as she battled back to overcome 2017 US Open finalist Keys on Court Philippe Chatrier.
Keys, an eight-time Grand Slam quarter-finalist, dominated the first set.
But an early break of serve was enough for Kudermetova to level the contest before the Russian secured victory in style with four successive breaks in the third.
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