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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 pro in 2017 at the Australian Open.
Early life and background
Kayla started playing tennis when she was seven years old. Her mother is from the Czech Republic.
Junior career
Kayla was No. 1 in the girls' 12s, 14s, 16s, and 18s US national rankings. In 2016, she climbed to No. 1 in the ITF junior rankings by winning the Junior US Open, reaching the semifinals at Wimbledon, and reaching the final at the Orange Bowl the previous year. She also won the 2016 Girls 18s National Championships to earn a wildcard into the main draw of the US Open. Kayla has been coached from the beginning by Larry Mousouris, who is also the coach of record to two other Junior US Open winners, Michael Falberg and Tim Triguero.
Shortly after turning 17, Day won her first career title at a $50k tournament in Macon, Georgia. The following week at Scottsdale, she reached the semifinals to enter the top 200 for the first time. With her combined performance at these two events, Day won the Australian Open Wild Card Challenge to earn a spot in the main draw at the first Grand Slam event of 2017.
2017
Day picked up her first WTA Tour wins of the season — and first wins of her career at a Premier Mandatory event — at the Indian Wells Open, including a victory over 2017 Australian Open semifinalist Mirjana Lučić-Baroni to reach the third round of the tournament.
Grand Slam performance timelines
Key
W
F
SF
QF
#R
RR
Q#
DNQ
A
NH
(W) winner; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (DNQ) did not qualify; (A) absent; (NH) not held; (SR) strike rate (events won / competed); (W–L) win–loss record.
To avoid confusion and double counting, these charts are updated at the conclusion of a tournament or when the player's participation has ended.
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Kayla at the 2016 US Open
United States
Valeria Solovyeva
Danielle Collins
Bianca Andreescu
Kaia Kanepi
Mirjam Björklund
Anhelina Kalinina 
Eudice Chong 
You Xiaodi
Viktória Kužmová
