NEW US Open champion Naomi Osaka says she does not feel sad about the way her win was overshadowed by Serena Williams' outbursts at the umpire. Osaka, 20, beat Williams 6-2 6-4 in Saturday's final, but the crowd booed as she received the trophy. Williams got a code violation for coaching, a penalty point for racquet abuse and a game penalty for calling the umpire a "thief" in New York. "At the time I did think they were booing at me," said Japan's Osaka. Speaking on The Ellen DeGeneres' Show she said: "I couldn't tell what was going on, it was so loud and a little bit stressful." Osaka remained composed throughout Williams' repeated on-court protests at umpire Carlos Ramos, as she…