Czech Katerina Siniakova upset Frenchwoman Varvara Gracheva, the No 7 seed, 6-4, 6-3 to advance to the quarter-finals of the Jiangxi Open at Nanchang International Tennis Center on Friday.

Siniakova, ranked No 60 in the world and a runner-up at the Hong Kong Open last week, will face German Laura Siegemund next. She has now won six of her last seven matches on the tour.

Siniakova Beat Chinese wildcard Yuhan Wang (6-3, 6-3) in the previous round of the tournament.

Earlier in the week, Gracheva, ranked No 45, won against Russian Kamilla Rakhimova (6-3, 6-4).

Nanchang WTA 250, other second round matches (Nanchang International Tennis Center, USD 259,303)

• Laura Siegemund beat Ulrikke Eikeri (LL): 6-1, 6-3
• Camila Osorio beat Sara Sorribes Tormo (8): 6-4, 7-5
• Diana Shnaider beat Vera Zvonareva: 6-3, 0-1 ret.
• Marie Bouzkova (3) beat Amina Anshba (LL): 7-5, 6-0
• Nao Hibino beat Kimberly Birrell: 6-3, 7-5
• Aliaksandra Sasnovich vs. Valeria Savinykh
• Xiaodi You vs. Leylah Fernandez