Naomi Osaka had a solid start to the defense of her U.S. Open title, posting a 6-4, 6-1 win over Marie Bouzkova of the Czech Republic that was a little closer than the final score suggested.

Osaka and Bouzkova were dead even through a hard-fought first set filled with tight games, long points and hard-hitting rallies. In the 10th game, Osaka finally forced Bouzkova into a backhand error on her third set point to take the lead with her first service break and claim the opening set.