US Open champion Naomi Osaka said she had “the worst attitude” in her loss to Lesia Tsurenko in the Brisbane International semi-finals.
The Japanese second seed was visibly frustrated as she was beaten 6-2 6-4 by Ukraine’s Tsurenko in just 66 minutes.
Osaka, who won her maiden Grand Slam title in September, said the defeat had taught her “a valuable lesson”.
“I was sulking a little bit, and there are moments that I tried not to do that,” the 21-year-old explained.
“I feel like I didn’t really know how to cope with not playing well.”
The world number five made 26 unforced errors against Tsurenko, and did not create a break opportunity until late in the second set.
Osaka told her coach Sascha Bajin during the match that she did not know why she was “flat”, adding: “I’m putting myself in the situation that either I win the match or I die.”
Speaking after the match, Osaka said: “I feel like, in a way, that this experience for me is better than winning the tournament.
“This helpless feeling I have, I learned sort of what I can do to improve the situation so there aren’t many moments that I feel like that.”
Osaka, who later withdrew from next week’s Sydney International, will move to fourth in the world rankings on Monday.
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Teenager Andreescu reaches Auckland final
Canadian teenager Bianca Andreescu continued her remarkable run as she beat Hsieh Su-wei to reach the Auckland International final.
The 18-year-old previously beat Caroline Wozniacki and Venus Williams to set up the meeting with the Taiwanese third seed.
Andreescu saved four break points and hit four aces en route to a 6-3 6-3 victory.
She will face defending champion Julia Gorges on Sunday, after the German beat Slovakia’s Viktoria Kuzmova 6-1 7-6 (8-6).
In Shenzhen, Aryna Sabalenka secured the first WTA title of the year with victory over American Alison Riske.
The Belarusian won 4-6 7-6 (7-2) 6-3 to secure her third career title.