Sofia Anna "Sonya" Kenin is an American professional tennis player. She has a career-high Women's Tennis Association (WTA) ranking of No. 7 in the world. She is the reigning champion at the Australian Open and the youngest American to win a Grand Slam women's singles title since Serena Williams in 2002. Kenin was named the WTA Most Improved Player of the Year in 2019, making her the first American to win the award also since Serena Williams in 1999. Kenin has won four WTA singles titles in total. She has also won two WTA doubles titles, including the 2019 China Open at the Premier Mandatory level with Bethanie Mattek-Sands.