Kayla Day (born September 28, 1999) is an American professional tennis player. She has a career-high ranking of No. 122 by the Women's Tennis Association (WTA). As a junior, she won one junior Grand Slam title, at the 2016 US Open. There, she also finished runner–up in the girls' doubles event, partnering with Caroline Dolehide. Despite having success as junior, Day is mostly spending time playing at the ITF Women's Circuit instead of WTA Tour, due to her ranking. She officially turned professional in 2017, at the Australian Open.
