she beat serena williams for the title and ms. williams was furious over questionable calls from the umpire, fans were furious, too, leading some of them to boo after the match. ms. osaka talked about the emotional toll of this on "today." >> well, i don't know, it just felt like everyone was sort of unhappy up there, and i know that it wasn't really like the ending wasn't how people wanted it to be, i know that in my dreams, i won like in a very tough competitive match, so i don't know, i just felt very emotional, and i felt like i had to apologize. >> if you're an introvert who excels at something that is highly public, no wonder that caused her problems. but i love to know how she's taking care of herself now. if she plans to remain a pro tennis player, how will she deal with the challenges to come? the answer might lie in the sport itself. or put another way. in the potential of sports to reshape our lives for the better. that is the focus of a new book