No. 1 Osaka loses 1st match since splitting from coach
Francois Nel / Getty Images Sport / Getty

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 Kristina Mladenovic at the Dubai Championships in a little more than an hour on Tuesday.

Osaka had not competed since winning the Australian Open in January for her second consecutive Grand Slam title.

That victory also allowed her to become the first tennis player from Asia to lead the rankings.

Last week, Osaka announced on Twitter that she would no longer work with coach Sascha Bajin.

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No. 1 Osaka loses 1st match since splitting from coach
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