DOHA - Three-times defending champion Iga Swiatek will face Latvia's Jelena Ostapenko in the Qatar Open semifinals on Friday after the Pole overcame Elena Rybakina 6-2 7-5.
Russia's Ekaterina Alexandrova, who defeated American sixth seed Jessica Pegula, will face another American Amanda Anisimova in the other semifinal.
In a repeat of last year's final, second seed Swiatek swept through the opening set, breaking Kazakhstan fifth seed Ryabkina's first service game to lead 2-0 and again to wrap up the set.
Rybakina, who discovered on Wednesday that the WTA had decided to uphold a ban against her former coach Stefano Vukov following an investigation into a potential breach of its code of conduct, recovered to break in the opening game of the second set.
Swiatek, playing with real intensity, hit back to level at 4-4 and with Rybakina serving to force a tiebreaker, the Pole made the decisive break.
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"I'm super happy and super proud of myself because playing against Elena is never easy," Swiatek said.
"At the beginning of the second set, I felt like she increased her levels. I needed to do that too in order to come back."
Rybakina came into the match with a 4-3 lead in their head-to-head record, but Swiatek will face Ostapenko after the Latvian beat Tunisia's Ons Jabeur 6-2 6-2 later on Thursday.
Pegula, US Open finalist last year, won the opening set, but in-form Alexandrova, who had beaten top seed and world number one Aryna Sabalenka in the second round, stormed back to win 4-6 6-1 6-1.
"I'm really happy with the way I'm playing right now," Alexandrova said.
Alexandrova, now on an eight-match winning streak, will meet Anisimova in the semifinal, with the 23-year-old American coming from a set down to advance 4-6 7-5 6-4 past Ukraine's Marta Kostyuk.
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Anisimova, ranked 41st, became the first female player to reach the singles semifinals of the Qatar Open having defeated four players in the top 30 of the rankings.
