(AP Photo/Kamran Jebreili)

DUBAI, United Arab Emirates (AP) Naomi Osaka lost her first match since moving up to No. 1 in the WTA rankings - and first since splitting from her coach.

The two-time major champion had trouble with her serve and was beaten 6-3, 6-3 by 67th-ranked Kristina Mladenovic at the Dubai Championships in a little more than an hour on Tuesday.

Afterward, Osaka wiped away tears while speaking to reporters and discussing the difficulty of dealing with her new-found spot atop the sport.

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