U.S. Open women's singles champion Naomi Osaka expressed cautious celebration two days after her win against Serena Williams at the U.S. Open final. "It still feels a little bit surreal but I think it's slowly sinking in," Osaka said on NBC News' TODAY show. Osaka defeated Williams 6-2, 6-4 on Saturday night to become the first Grand Slam singles champion from Japan. Her win was overshadowed by Williams' getting hit with three code violations that led to a $17,000 fine.
