Newly-crowned U.S. Open women's singles champion Naomi Osaka arrived in Japan Thursday to a hero's welcome.The 20-year-old, who stunned childhood idol and 23-time Grand Slam winner Serena Williams in straight sets in the U.S. Open final in New York on Saturday, was welcomed early in the morning by dozens of fans and members of the media at Tokyo's Haneda airport."When I came here and there were a lot of people waiting at the airport, I was really surprised and happy," Osaka said at a press conference in Yokohama later Thursday morning. "I appreciate all the support."In winning the U.S. Open…READ FULL ARTICLE