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Ostapenko and Sje, who are fourth in the tournament, beat Japanese Shuko Ajamam and Kristin Buks from Spain in the second round with a 6-1, 3-6, 10: 4.
Ostapenko earned 215 world rankings for victory. In the quarterfinals, Ostapenko and Sje will play with Slovakian representative Mikhalikov and British athletes Olivia Nicholas.
In the first round, the Latvian and Taiwan duo, with 5-7, 6-4, 11: 9, defeated Taiwanese Chan Hodgin and Chinese Jiang Sjinju.
It has already been reported that both Ostapenko and Anastasia Sevastova lost in the second round.
The WTA 1000 tournament in Beijing takes place on solid pavement courts.
