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BEIJING, Oct. 3-- Round of 16 action at the 2019 China Open ended with the defending men's singles champion crashing out, while other top seeds moved into the quarterfinals here on Thursday. Action on the Diamond Court got underway with 16th seeded Caroline Wozniacki overcoming several scares to edge past Czech No. 47 Katerina Siniakova in straight sets 7-5, 6-4. The two traded breaks twice in the first set to go 4-4, with both players keeping it tight and committing very few unforced errors. Siniakova would be the one to blink first when serving to force a tiebreak at 5-6 with several netted errors. Wozniacki went a break up to go 4-1 in the second, only to watch that lead shrink to 5-4 off a double fault and then a series of netted unforced errors when serving for the match. Undeterred, Wozniacki turned it around to respond with a break of her own and seal the win in just over 90 minutes. Up next for Wozniacki is Daria Kasatkina, after the Russian defeated her compatriot Ekaterina Alexandrova 6-4, 6-3, despite making no fewer than nine double faults over the course of the match. World No. 4 Naomi Osaka of Japan logged another straight-set win, moving past Wuhan Open runner-up Alison Riske 6-4, 6-0. Osaka was slow getting into form, while Riske was very agile out of the gate, fighting her to deuce on her opponent's first two service games before finally converting to go a break up at 4-2. | 
