Wikipedia - Kayla Day
Kayla Day (born September 28, 1999) is an American professional tennis player. She has a career-high singles ranking of world No. 86 by the WTA. As a junior, she won one junior Grand Slam title, at the 2016 US Open. There, she finished runner–up in the doubles event, partnering with Caroline Dolehide.
Despite having success as junior, Day has mostly spent time playing on the ITF Women's Circuit instead of WTA Tour, due to her ranking. She officially turned professional in 2017, at the Australian Open.