Sloane Stephens, Karolina Pliskova and Kiki Bertens were among the leading names knocked out at the Kremlin Cup on Wednesday.
Johanna Konta has had a 2018 to forget but the British number one reached round two in Moscow at Elise Mertens' expense.
The Hong Kong Open will feature a surprise finalist in Dayana Yastremska, with Wang Qiang beating Garbine Muguruza in the other semi-final.
A quarter-final upset was on the cards when play stopped in Hong Kong, with Elina Svitolina facing defeat against Wang Qiang.
Despite suffering a recent run of poor form, two-time grand slam champion Garbine Muguruza outclassed Ana Bogdan in Hong Kong.
Seeds Elina Svitolina and Garbine Muguruza recorded straightforward victories on Tuesday to reach the last 16 in Hong Kong.
Aryna Sabalenka outlined her promise again with a straight-sets win over Garbine Muguruza and Jelena Ostapenko was hammered in Beijing.
After a tough stretch, Caroline Wozniacki showed signs of recovery with a victory at the China Open on Monday.
Caroline Wozniacki, Garbine Muguruza, Angelique Kerber and Petra Kvitova followed Simona Halep out of the Wuhan Open.
Simona Halep was troubled by injury in a loss to Dominika Cibulkova, while Caroline Garcia was beaten by Katerina Siniakova in Wuhan.