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 youngest American to win a Grand Slam women's singles title since Serena Williams in 2002. Kenin has won four singles titles and two doubles titles on the WTA Tour. She was also 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.