Kayla Day once stood at the top of the tennis world before she’d even turned pro, winning the 2016 US Open juniors as the first American girl to do it in four years.
A decade later, her Kayla Day net worth story is less about endorsement millions and more about the grinding economics of life on the WTA and ITF tours.
Kayla Day’s Biography
| Category | Details |
|---|---|
| Full Name | Kayla Day |
| Date of Birth | September 28, 1999 |
| Age | 26 |
| Nationality | American |
| Height | 5 ft 8 in (173 cm) |
| Plays | Left-handed |
| Current World Ranking | WTA No. 137 (July 2026) |
| Career-High Ranking | WTA No. 84 (April 2024) |
| Turned Professional | 2016 |
| Years Active | 2016–present |
| Coach | Henner Nehles |
| Net Worth | $400,000 |
| Career Prize Money | Approximately $1.39 million |
| Grand Slam Titles | 0 (senior); 1 junior Grand Slam, 2016 US Open) |
Early Life and Tennis Journey
Kayla Day was born on September 28, 1999, in Santa Barbara, California.
She picked up a racket at age seven after watching her mother play, and her mother’s family background in the Czech Republic gave her an early bilingual upbringing.
Day rose quickly through American junior rankings, holding the No. 1 spot nationally in the girls’ 12s, 14s, 16s, and 18s divisions.
Her breakout year came in 2016, when she reached the Wimbledon junior semifinals and the Orange Bowl final before capturing the biggest prize of all.
That September, Day won the 2016 US Open girls’ singles title, becoming the first American girl to win a junior Grand Slam since Samantha Crawford in 2012. She also reached the junior doubles final that same fortnight, partnering Caroline Dolehide.
Her junior success carried her straight into the professional ranks. She earned a US Open wild card in 2016 by winning the USTA Girls’ 18s National Championship, then made her WTA Tour debut that August at the Connecticut Open as a lucky loser.
Professional Tennis Career
Day’s early pro years were a slow climb through the ITF Women’s Circuit and WTA Challenger events, interrupted by injuries and inconsistent form.
She did not return to a Grand Slam main draw until the 2023 French Open, six years after her 2017 Australian Open debut.
That 2023 Roland Garros run became a career highlight. Day beat Kristina Mladenovic and Madison Keys back-to-back before falling to Anna Karolina Schmiedlova in the third round, her best Grand Slam result to date.
She backed that up by winning ITF titles at Granby and Bonita Springs later in 2023, cracking the WTA top 100 for the first time.
In 2024, she reached her career-high ranking of world No. 84 after entering the Indian Wells main draw as a lucky loser for injured defending champion Elena Rybakina.
Day added two more ITF titles in 2025 at Southaven and Templeton, and reached the semifinals of the WTA 125 event in Guadalajara.
In June 2026, she qualified for her Wimbledon main-draw debut, completing an appearance at all four majors, before losing in the first round to Madison Keys.
Coach
Day has worked with German-born coach Henner Nehles since her mid-teens, a partnership documented publicly when she won her junior Grand Slam title. Nehles is a former UNLV standout who has also worked with Jelena Jankovic and Sam Querrey.
Earlier in her junior career, Day trained under Larry Mousouris, who also coached fellow US Open junior champions Michael Falberg and Tim Trigueiro.
Her official WTA profile also lists a past coaching stint with Cecil Mamiit, though the exact timeline of that arrangement has not been detailed publicly.
Kayla Day’s Net Worth Details
As of 2026, Kayla Day’s has an estimated net worth of $400,000.
Her financial picture is built almost entirely on tour prize money, since no major endorsement deals have been publicly confirmed at her current ranking level.
Career Prize Money
According to official ATP/WTA profile data hosted by Roland Garros, Day has earned approximately $1.39 million in career prize money. Independent trackers place the figure slightly lower, closer to $1.29 million, reflecting differences in how ITF Circuit earnings are counted.
Her 2023 run to the French Open third round produced one of her larger single-tournament paydays.
Her official WTA prize money for the 2026 season stood at $107,175 through the middle of the year.
Career Earnings By Year
| Year | Notable Results | Prize Money |
|---|---|---|
| 2016 | Turned pro; US Open junior champion | Not separately published |
| 2022 | 41-21 win-loss record; 2 ITF titles | Not separately published |
| 2023 | French Open 3R; 2 ITF titles (Granby, Bonita Springs); Top 100 debut | Not separately published |
| 2024 | Career-high ranking No. 84; Indian Wells main draw | Not separately published |
| 2025 | 2 ITF titles (Southaven, Templeton); WTA 125 Guadalajara SF | Not separately published |
| 2026 (YTD) | Wimbledon main-draw debut | $107,175 |
Career Statistics
| Year | Titles Won | Grand Slams (Best Result) | Win/Loss Record |
|---|---|---|---|
| 2022 | 2 (ITF) | Did not qualify | 41-21 |
| 2023 | 2 (ITF) | French Open, 3R | Not fully published |
| 2024 | 0 | Indian Wells (WTA 1000, main draw) | Not fully published |
| 2025 | 2 (ITF) | Wimbledon, Qualifying | Not fully published |
| 2026 | 0 (YTD) | Wimbledon, 1R (main draw debut) | 31-11 (WTA Tour, YTD) |
FAQs
What is Kayla Day’s net worth?
Kayla Day’s estimated net worth is around $400,000, based mainly on career prize money since no major endorsement deals are publicly confirmed.
How much has Kayla Day earned in career prize money?
Official tour data places her career prize money at approximately $1.39 million since turning professional in 2016.
Has Kayla Day won a Grand Slam title?
She has not won a senior Grand Slam, but she won the 2016 US Open junior girls’ singles title as a 16-year-old.
Who is Kayla Day’s coach?
She has worked with Henner Nehles, a German-born former UNLV player, since her mid-teens, alongside earlier coaching from Larry Mousouris.
What is Kayla Day’s current world ranking?
Day is ranked No. 137 by the WTA, with a career-high ranking of No. 84 reached in April 2024.
