
Naomi Osaka (born October 16, 1997) is a Japanese professional tennis player. She 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 as well the first player from Japan - man or woman - to reach No. 1. She is a four-time Grand Slam singles champion, and is the reigning champion at the Australian Open. Her seven titles on the WTA Tour also include two at the Premier Mandatory level. At the 2018 US Open and the 2019 Australian Open, Osaka won her first two Grand Slam singles titles in back-to-back Grand Slam tournaments, and is the first player to achieve this feat since Jennifer Capriati in 2001. She also became the first woman to win successive Grand Slam singles titles since Serena Williams in 2015. Born in Japan to a Haitian father and a Japanese mother, Osaka has lived and trained in the United States since age three. She came to prominence at age 16 when she defeated former US Open champion Samantha Stosur in her WTA Tour debut at the 2014 Stanford Classic. Two years later, she reached her first WTA final at the 2016 Pan Pacific Open in Japan to enter the top 50 of the WTA rankings. Osaka made her breakthrough into the upper echelon of women's tennis in 2018 when she won her first WTA title at the Indian Wells Open. Later in the year, she defeated 23-time Grand Slam singles champion Serena Williams in the final of the US Open to become the first Japanese player to win a Grand Slam singles title. Since 2018, she has won a Grand Slam singles title in four consecutive years.