Despite missing her goal of a tournament victory in front of her Japanese fans, an exhausted Naomi Osaka said she was proud of having reached the final of the Toray Pan Pacific Open on Sunday.

Just two weeks after winning the U.S. Open, the 20-year-old's Pan Pacific campaign ended in a 6-4, 6-4 loss to the Czech Republic's Karolina Pliskova in front of a vocal home crowd at Arena Tachikawa Tachihi.

The U.S.-based Osaka, who is of Japanese and Haitian descent, said the quick turnaround between tournaments had given her little time to recuperate or take stock of her recent achievements.

"I feel like I haven't really had much time to rest, so I don't know, I feel really tired right now. But...to play the finals of the U.S. Open and then come here, I think I did pretty well. So if there's anything I can take away from this, I think I'm proud of myself," the world No. 7 said.

Despite the loss against the eighth-ranked Pliskova, Osaka remains well on track to achieve her goal of qualifying for the season-ending WTA Finals in Singapore for the first time.

"Definitely I want to go to Singapore. I played there once for the Rising Stars, and it's the last year (the WTA Finals) are going to be there, I think that's definitely my main goal," she said.

Naomi Osaka

The young star admitted to feeling overwhelmed against Pliskova, partly as a result of the intense level of public and media attention brought about by her U.S. Open victory.

"I definitely can't say I'm used to it...but I don't know, for me things have been going so fast since New York, I haven't really been able to sit back and see fully what's going on," she said.

"I felt very overwhelmed today...I don't want to seem ungrateful that I lost, because to even reach the final is a very good thing, so I mean I'm really grateful for everything."

Osaka will take a break this week. She had been scheduled to appear in the Wuhan Open in China, which began Sunday, but organizers have announced her withdrawal.

After the Toray final, she hinted at a possible withdrawal in order to rest, saying the chances of her participation were "very low."

Naomi Osaka