Kiki Bertens saw her hopes of picking up ranking points in Linz blocked by a resurgent Margarita Gasparyan on Thursday.
Nao Hibino bore the brunt of Singapore-seeking Elina Svitolina's anger in Hong Kong, the top seed sealing victory in less than an hour.
All the big names progressed to the last eight at the Shanghai Masters apart from Juan Martin del Potro, who withdrew due to injury.
Roberto Bautista Agut had never previously won a set against Roger Federer, but the Swiss was pushed all the way in a 6-3 2-6 6-4 win.
Marco Cecchinato pulled off a stunning defeat of Novak Djokovic at Roland Garros, but it was a very different story in Shanghai.
Roger Federer was left applauding a remarkable backhand volley on the stretch from Daniil Medvedev in his three-set win on Wednesday.
Needing to reach the last eight to add to her points tally for the WTA Finals, Kiki Bertens advanced to the second round of the Linz Open.
Despite suffering a recent run of poor form, two-time grand slam champion Garbine Muguruza outclassed Ana Bogdan in Hong Kong.
Alexander Zverev is closing in on an ATP Finals spot after winning in Shanghai, while Roger Federer also reached the third round.
After flash floods in his home island of Majorca, Rafael Nadal has opened the doors of his academy to those affected by the disaster.