Japan's world No 1 Naomi Osaka in action during her 6-3, 6-3 second-round defeat to Kristina Mladenovic of France at the Dubai Duty Free Tennis Championships on Tuesday night. EPA

A tearful Naomi Osaka said she was struggling with the attention of being the world’s top-ranked woman after being stunned 6-3 6-3, by France’s Kristina Mladenovic in her opening match at the Dubai Duty-Free Tennis Championships on Tuesday.

Playing her first match since claiming the number one ranking with her Australian Open triumph, the Japanese 21-year-old capitulated in just over an hour, having won less than half of her first serve points while making 25 unforced errors.

It was the second major surprise in a week involving US. Open champion Osaka, who announced she had parted ways with Sascha Bajin, the coach who had guided her in both her Grand Slam victories.

“This match is the result of that,” Osaka told reporters of her coaching shake-up. “I’m pretty sure as time goes on you guys will stop talking about it. For now, it’s like the biggest tennis news, I guess.

“See, it’s a little bit hard because I feel like people are staring at me, and not in a good way.”

The hard-hitting Osaka has become one of tennis’s most bankable players since upsetting American great Serena Williams in the final at Flushing Meadows but has always spoken of feeling uncomfortable in the spotlight.

Osaka wiped away tears as she spoke of the challenge of adjusting to her new celebrity.

“I don’t think I necessarily understand what position I’m in a way,” she said.

“And because last year I wasn’t even anywhere close to this ranking and people didn’t pay attention to me and that’s something that I’m comfortable with.

“I don’t know why I’m crying,” she said with a smile. “I don’t know why this is happening. I don’t really like the attention, so yeah, it’s been a little tough.”

Mladenovic, ranked 67th, hit fewer winners than Osaka but converted seven of 10 break points to claim her first win over a world number one.

“It means a lot, honestly,” Mladenovic said after booking a match with a Spain’s Carla Suarez Navarro in the last 16.

“I know I’m capable of beating great players.”

Osaka aside, most of the other big names progressed safely to the third round.

Japan's world No 1 Naomi Osaka in action during her 6-3, 6-3 second-round defeat to Kristina Mladenovic of France at the Dubai Duty Free Tennis Championships on Tuesday night. EPA

Japan's world No 1 Naomi Osaka in action during her 6-3, 6-3 second-round defeat to Kristina Mladenovic of France at the Dubai Duty Free Tennis Championships on Tuesday night. EPA

Japan's world No 1 Naomi Osaka in action during her 6-3, 6-3 second-round defeat to Kristina Mladenovic of France at the Dubai Duty Free Tennis Championships on Tuesday night. EPA

Japan's world No 1 Naomi Osaka in action during her 6-3, 6-3 second-round defeat to Kristina Mladenovic of France at the Dubai Duty Free Tennis Championships on Tuesday night. EPA

Japan's world No 1 Naomi Osaka in action during her 6-3, 6-3 second-round defeat to Kristina Mladenovic of France at the Dubai Duty Free Tennis Championships on Tuesday night. EPA

Japan's world No 1 Naomi Osaka in action during her 6-3, 6-3 second-round defeat to Kristina Mladenovic of France at the Dubai Duty Free Tennis Championships on Tuesday night. EPA

Kristina Mladenovic of France in action during her 6-3, 6-3 second-round win over Japan's world No 1 Naomi Osaka at the Dubai Duty Free Tennis Championships on Tuesday night. Getty Images

Japan's world No 1 Naomi Osaka in action during her 6-3, 6-3 second-round defeat to Kristina Mladenovic of France at the Dubai Duty Free Tennis Championships on Tuesday night. EPA

Japan's world No 1 Naomi Osaka in action during her 6-3, 6-3 second-round defeat to Kristina Mladenovic of France at the Dubai Duty Free Tennis Championships on Tuesday night. EPA

Japan's world No 1 Naomi Osaka in action during her 6-3, 6-3 second-round defeat to Kristina Mladenovic of France at the Dubai Duty Free Tennis Championships on Tuesday night. EPA

Japan's world No 1 Naomi Osaka in action during her 6-3, 6-3 second-round defeat to Kristina Mladenovic of France at the Dubai Duty Free Tennis Championships on Tuesday night. EPA

Japan's world No 1 Naomi Osaka in action during her 6-3, 6-3 second-round defeat to Kristina Mladenovic of France at the Dubai Duty Free Tennis Championships on Tuesday night. EPA

Kristina Mladenovic of France in action during her 6-3, 6-3 second-round win over Japan's world No 1 Naomi Osaka at the Dubai Duty Free Tennis Championships on Tuesday night. Getty Images

Kristina Mladenovic of France celebrates winning her second round match against Naomi Osaka of Japan at the Dubai Duty Free Tennis WTA Championships 2019 in Dubai. EPA

Naomi Osaka, left, and Kristina Mladenovic shake hands after the match. EPA

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