Naomi Osaka said on Thursday that she was “angry relaxed” as the Japanese tennis player set up a cracking first meeting with US Open champion Bianca Andreescu in Beijing.

The 21-year-old, the reigning Australian Open and 2018 US Open champion, won the last 10 games against unseeded American Alison Riske to surge into the last eight at the China Open, 6-4, 6-0. The 19-year-old Canadian beat American qualifier Jennifer Brady 6-1, 6-3 in the later match on Thursday.

Osaka has not dropped a set in three matches in the Chinese capital and also did not lose a set on the way to winning her home Pan Pacific Open last month.

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It is in contrast to the stuttering form the world No 4 endured after winning the Australian Open at the start of the year.

“I’m relaxed, but I’m a little bit angry, it’s an angry relaxed,” said Osaka, asked what was behind her recent success in Japan and now China.

“I know after Australia I was like, ‘I’m going to have fun’. It was not fun, I did not have fun.”

The Japanese said she took a week off after her last 16 defeat at the US Open, where teenager Andreescu went on to triumph over Serena Williams in the final.

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“I was sorting out my thoughts,” said Osaka, adding that she has “self-diagnosed ADHD” because “if I tell myself to relax, I play three-set matches.

“Out here, if you see, I’m kind of ‘angry’ right now, I can get through straight-set wins.”

Collated results from the WTA/ATP China Open tennis in Beijing on Thursday (x denotes seeding):

Women - 3rd round:

Bianca Andreescu (CAN x5) bt Jennifer Brady (USA) 6-1, 6-3

Naomi Osaka (JPN x4) bt Alison Riske (USA) 6-4, 6-0

Darya Kasatkina (RUS) bt Ekaterina Alexandrova (RUS) 6-4, 6-3

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Caroline Wozniacki (DEN x16) bt Katerina Siniakova (CZE) 7-5, 6-4

Men - 2nd round

Alexander Zverev (GER x2) bt Felix Auger Aliassime (CAN) 6-3, 6-1

John Isner (USA) bt Dan Evans (GBR) 7-6 (7/3), 7-5

Stefanos Tsitsipas (GRE x3) bt Nikoloz Basilashvili (GEO) 4-6, 6-3, 6-2

Sam Querrey (USA) bt Diego Schwartzman (ARG) 7-6 (7/2), 6-7 (6/8), 6-3

With AFP Inputs