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Kayla Day (born September 28, 1999) is an American professional tennis player. She has a career-high singles ranking of world No. 84 by the WTA. As a junior, she won one junior major 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.
Shortly after turning 17, Day won her first career title at the 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, she won the Australian Open Wild Card Challenge to earn a spot in the main draw at the first major event of 2017.
Day picked up her first tour wins of the season — and first wins of her career at a Premier Mandatory event — at the 2017 Indian Wells Open, including a victory over 2017 Australian Open semifinalist Mirjana Lučić-Baroni to reach the third round of the tournament.
She claimed the title at the Championnats de Granby, defeating Katherine Sebov in the final and moving to world No. 94 as a result.
At the Indian Wells Open, she entered the main draw as a lucky loser replacing fourth seed and defending champion, Elena Rybakina, directly in the second round where she lost to Nadia Podoroska. She reached a career-high ranking of No. 84, on 1 April 2024.
She lost to lucky loser Hailey Baptiste in the first round at the French Open.
| Grand Slam tournaments | ||||||||||
| Australian Open | A | 1R | Q3 | A | Q2 | 1R | 0 / 2 | 0–2 | ||
| French Open | A | Q2 | Q1 | A | 3R | 1R | 0 / 2 | 2–2 | ||
| Wimbledon | A | Q1 | A | A | Q2 | Q2 | 0 / 0 | 0–0 | ||
| US Open | 2R | 1R | Q1 | Q2 | 1R | Q1 | 0 / 3 | 1–3 | ||
| Win–loss | 1–1 | 0–2 | 0–0 | 0–0 | 2–2 | 0–2 | 0 / 7 | 3–7 | ||
| WTA 1000 | ||||||||||
| Qatar Open | A | A | A | A | A | 0 / 0 | 0–0 | |||
| Dubai | A | A | A | A | A | 0 / 0 | 0–0 | |||
| Indian Wells Open | A | 3R | 1R | A | A | 0 / 2 | 2–2 | |||
| Miami Open | A | Q1 | A | A | A | 0 / 0 | 0–0 | |||
| Madrid Open | A | A | A | A | A | 0 / 0 | 0–0 | |||
| Italian Open | A | A | A | A | A | 0 / 0 | 0–0 | |||
| Canadian Open | A | A | A | A | 1R | 0 / 1 | 0–1 | |||
| Cincinnati Open | A | Q1 | A | A | A | 0 / 0 | 0–0 | |||
| Guadalajara Open | A | A | A | 1R | A | 0 / 1 | 0–1 | |||
| Wuhan Open | A | A | A | NH | 0 / 0 | 0–0 | ||||
| China Open | A | A | A | NH | Q1 | 0 / 0 | 0–0 | |||
| Win–loss | 0–0 | 2–1 | 0–1 | 0–1 | 0–1 | 0 / 4 | 2–4 | |||
| Career statistics | ||||||||||
| 2016 | 2017 | 2018 | ... | 2022 | 2023 | SR | W–L | Win % | ||
| Tournaments | 2 | 5 | 2 | 2 | 6 | Career total: 17 | ||||
| Titles | 0 | 0 | 0 | 0 | 0 | Career total: 0 | ||||
| Finals | 0 | 0 | 0 | 0 | 0 | Career total: 0 | ||||
| Overall win–loss | 1–2 | 3–5 | 0–2 | 0–2 | 3–6 | 0 / 17 | 7–17 | |||
| Year-end ranking | 195 | 154 | 300 | 195 | 87 | $860,655 | ||||
| W100 tournaments (2–0) |
| W80 tournaments (0–1) |
| W60/75 tournaments (2–1) |
| W25/35 tournaments (3–5) |
| W15 tournaments (0–1) |
| Loss | 0–1 | May 2016 | ITF Naples, United States | 25,000 | Clay | Valeria Solovyeva | 4–6, 0–6 |
| Win | 1–1 | Oct 2016 | Tennis Classic of Macon, United States | 50,000 | Hard | Danielle Collins | 6–1, 6–3 |
| Loss | 1–2 | Feb 2017 | Rancho Santa Fe Open, United States | 25,000 | Hard | Bianca Andreescu | 4–6, 1–6 |
| Loss | 1–3 | Sep 2021 | ITF Fort Worth, United States | W25 | Hard | Kaia Kanepi | 2–6, 1–6 |
| Loss | 1–4 | Oct 2021 | ITF Austin, United States | W25 | Hard | Mirjam Björklund | 6–2, 2–6, 2–6 |
| Win | 2–4 | May 2022 | ITF Naples, United States | W25 | Clay | Ana Sofía Sánchez | 6–1, 6–1 |
| Loss | 2–5 | Jun 2022 | ITF Wichita, United States | W25 | Hard | Elizabeth Mandlik | 3–6, 3–6 |
| Win | 3–5 | Oct 2022 | ITF Redding, United States | W25 | Hard | Jamie Loeb | 6–3, 6–4 |
| Win | 4–5 | May 2023 | Bonita Springs Championship, United States | W100 | Clay | Ann Li | 6–2, 6–2 |
| Win | 5–5 | Jul 2023 | Championnats de Granby, Canada | W100 | Hard | Katherine Sebov | 6–4, 2–6, 7–5 |
| Loss | 5–6 | Oct 2023 | Tyler Pro Challenge, United States | W80 | Hard | Emma Navarro | 3–6, 4–6 |
| Loss | 5–7 | Apr 2024 | Charlottesville Open, United States | W75 | Clay | Louisa Chirico | 1–6, 5–7 |
| Loss | 5–8 | Jul 2025 | ITF San Diego, United States | W15 | Hard | Tianmei Wang | 4–6, 3–6 |
| Win | 6–8 | Aug 2025 | ITF Southaven, United States | W25 | Hard | Ana Sofía Sánchez | 6–4, 6–1 |
| Win | 7–8 | Sep 2025 | ITF Templeton, United States | W75 | Hard | Kayla Cross | 6–2, 3–0 ret. |
| W100 tournaments |
| W75 tournaments |
| W25/35 tournaments |
| Loss | 0–1 | Feb 2017 | Midland Tennis Classic, United States | 100,000 | Hard (i) | Caroline Dolehide | Ashley Weinhold Caitlin Whoriskey | 6–7(1), 3–6 |
| Win | 1–1 | Feb 2017 | Rancho Santa Fe Open, United States | 25,000 | Hard | Caroline Dolehide | Anhelina Kalinina Chiara Scholl | 6–3, 1–6, 10–7 |
| Win | 2–1 | Feb 2019 | Rancho Santa Fe Open, United States | W25 | Hard | Sophia Whittle | Eudice Chong You Xiaodi | 6–2, 5–7, 10–7 |
| Win | 3–1 | Oct 2024 | Edmond Open, United States | W75 | Hard | Jaimee Fourlis | Sophie Chang Rasheeda McAdoo | 7–5, 7–5 |
| Loss | 3–2 | May 2025 | ITF Boca Raton, United States | W35 | Clay | Allura Zamarripa | Fiona Crawley Alana Smith | 4–6, 2–6 |
| Win | 2016 | US Open | Hard | Viktória Kužmová | 6–3, 6–2 |
| Loss | 2016 | US Open | Hard | Caroline Dolehide | Jada Hart Ena Shibahara | 6–4, 2–6, 11–13 |
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