Question: who is osaka tennis player?
Answer: Naomi Osaka (大坂 なおみ Japanese pronunciation: [o̞ːsäkä näo̞mi], Ōsaka Naomi, born October 16, 1997) is a professional tennis player who represents Japan. Osaka has been ranked No. 1 by the Women's Tennis Association (WTA), and is the first Asian player to hold the top ranking in singles.