Asked by AFP at her post-match press conference why she appeared happier in defeat than she did after winning on Friday, Osaka said: "I don't have any regrets from today.
The depth of the draw for this year's tournament is fantastic, and tennis fans will be spoilt for choice with World No.5 Elina Svitolina, 2017 French Open champion Jelena Ostapenko, 2017 Wimbledon champion Garbiñe Muguruza and China's top two players Wang Qiang and Zhang Shuai leading the field".
In the men's Beijing Open, top seed Juan Martin del Potro progressed to the final by walkover against Italy's Fabio Fognini. Zhang broke to go 2-0 up and Osaka - who has admitted struggling with the fall-out from the US Open final, when Williams rowed with the chair umpire - began welling up.
"Then if you win one Grand Slam, they're like, 'Oh, she only won one Grand Slam.' I know it's bad, but I sort of read the comments".
"I feel great being here. I became number one here for the first time many years ago - eight years ago", said Wozniacki.
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Unseeded Sevastova needed one hour and 31 minutes to win and reach the final, the biggest in her career.
"I'm kind of happy that I was able to get this far".
"Unfortunately, I have been playing through pain in my back this whole week", the world number six said in a subsequent statement released by organisers.
If she wins against Wozniacki, Sevastova will rise to world number 11 but only to world number 12 if she loses.
"Having done everything, all of that, it's pretty unbelievable".