Photo/IllutrationNaomi Osaka holds up the trophy after defeating Serena Williams in the women's final of the U.S. Open tennis tournament in New York on Sept. 8. (AP Photo)

  • Photo/Illustraion

In great timing for Citizen Watch Co., its new brand ambassador became the first tennis player born in Japan to win a Grand Slam singles title.

And in a marketing coup for the company, Naomi Osaka was wearing its watch, whose new model is due out this week, when she defeated Serena Williams in the U.S. Open women's singles final on Sept. 8.

The new model of the Citizen Eco-Drive Bluetooth BZ4006-01E, an analog watch with a traditional clock face, will hit the marketplace on Sept. 14.

The suggested retail price of the unisex watch, which can link with a smartphone through Bluetooth wireless technology and notify the wearer of incoming calls and e-mails, is 80,000 yen ($717.30), excluding tax.

Citizen Watch signed a sponsorship deal with Osaka in late August.