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, reached in April 2024. As a junior, she won the 2016 US Open in singles and was a finalist in doubles, partnering with Caroline Dolehide.
Day plays mostly on the ITF Women's Circuit and the WTA 125 Challenger Tour.
Early life and background Day started playing tennis when she was seven years old. Her mother is from the Czech Republic.
Juniors She was No. 1 in the girls' 12s, 14s, 16s, and 18s national US rankings. In 2016, Day climbed to the top of the ITF junior rankings by winning the 2016 Junior US Open, reaching semifinals at the 2016 Wimbledon, and reaching the final at the Orange Bowl the previous year. She also achieved her best doubles result at a major event as a runner-up at the 2016 Junior US Open with partner Caroline Dolehide. She won the 2016 USTA Girls 18s National Championships to earn a wildcard into the main draw of the US Open. Day has been coached from the beginning by Larry Mousouris, who has coached two other Junior US Open winners, Michael Falberg and Tim Trigueiro.
Professional 2016-2018: Turned pro, first title, major & Premier debuts
Day made her WTA Tour debut at the 2016 Connecticut Open in New Haven, after reaching the main draw as a lucky loser, having defeated Naomi Broady and Kirsten Flipkens along the way. The following week, she played in her first career Grand Slam at the 2016 US Open, and won her first match against compatriot Madison Brengle.
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. She officially turned professional in 2017, at the Australian Open. Day picked up her first WTA Tour wins of the 2017 season, and first wins of her career at a Premier Mandatory event in Indian Wells, including a victory over 2017 Australian Open semifinalist Mirjana Lučić-Baroni to reach the third round of the tournament.
2022: Back to WTA 1000 level After almost five years of absence at the WTA 1000 level, she qualified for the main draw at the Guadalajara Open where she lost in the first round to Eugenie Bouchard.
2023: French Open third round, top 100 Day won three matches in the French Open qualifying to make her first main draw at Roland Garros, as well as her first Grand Slam tournament appearance since the 2017 US Open. She defeated wildcard Kristina Mladenovic and 20th seed Madison Keys to reach the third round of a major for the first time. Day lost to Anna Karolína Schmiedlová in the third round.
She claimed the title at the Championnats de Granby, defeating Katherine Sebov in the final and moving to world No. 94 as a result.
2024-2026: First WTA 1000-win Day lost to Viktoriya Tomova in the first round of the 2024 Australian Open.
At the 2024 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 April 1, 2024.
Day lost to lucky loser Hailey Baptiste in the first round at the 2024 French Open.
In September 2025, she won her seventh professional title on her 26th birthday at the 2025 Central Coast Pro Tennis Open in Templeton, California.
Day qualified for the 2026 Indian Wells Open and defeated Francesca Jones, before losing to second seed Iga Świątek, in the second round.
In June 2026, Day qualified to make her main-draw debut at Wimbledon, meaning she had achieved the feat at all four major tournaments. She lost to 26th seed Madison Keys in the first round.
Singles performance timeline Only main-draw results in WTA Tour, Grand Slam tournaments, Billie Jean King Cup, United Cup, Hopman Cup and Olympic Games are included in win–loss records.
Current through the 2024 Guadalajara Open. Tournament201620172018...2022202320242025SRW–LWin %Grand Slam tournaments Australian OpenA1RQ3AQ21RA0 / 20–2 French OpenAQ2Q1A3R1RA0 / 22–2 WimbledonAQ1AAQ2Q2Q10 / 00–0 US Open2R1RQ1Q2 1RQ1Q10 / 31–3Win–loss1–10–20–00–02–20–20–00 / 73–7WTA 1000Qatar OpenAAAAAAA0 / 00–0DubaiAAAAAAA0 / 00–0Indian Wells OpenA3R1RAA2RA0 / 32–3Miami OpenAQ1AAAQ1A0 / 00–0Madrid OpenAAAAAAA0 / 00–0Italian OpenAAAAAAA0 / 00–0Canadian OpenAAAA1RQ2A0 / 10–1Cincinnati OpenAQ1AAAAA0 / 00–0Guadalajara OpenAAA1RA1RA0 / 20–2Wuhan OpenAAANH0 / 00–0China OpenAAANHQ1AA0 / 00–0Win–loss0–02–10–10–10–10 / 42–4Career statistics201620172018...20222023SRW–LWin %Tournaments25226Career total: 17Titles00000Career total: 0Finals00000Career total: 0Overall win–loss1–23–50–20–23–60 / 177–17Year-end ranking 19515430019587245261$860,655
ITF Circuit finals Singles: 20 (11 titles, 9 runner-ups) LegendW100 tournaments (2–0)W80 tournaments (0–1)W60/75 tournaments (2–2)W50 tournaments (2–0)W25/35 tournaments (5–5)W15 tournaments (0–1) ResultW–LDateTournamentTierSurfaceOpponentScoreLoss 0–1 May 2016ITF Naples, United States25,000 Clay Valeria Solovyeva 4–6, 0–6Win 1–1 Oct 2016Tennis Classic of Macon, United States50,000 Hard Danielle Collins 6–1, 6–3Loss 1–2 Feb 2017Rancho Santa Fe Open, United States25,000 Hard Bianca Andreescu 4–6, 1–6Loss 1–3 Sep 2021ITF Fort Worth, United StatesW25 Hard Kaia Kanepi 2–6, 1–6Loss 1–4 Oct 2021ITF Austin, United StatesW25 Hard Mirjam Björklund 6–2, 2–6, 2–6Win 2–4 May 2022ITF Naples, United StatesW25 Clay Ana Sofía Sánchez 6–1, 6–1Loss 2–5 Jun 2022ITF Wichita, United StatesW25 Hard Elizabeth Mandlik 3–6, 3–6Win 3–5 Oct 2022ITF Redding, United StatesW25 Hard Jamie Loeb 6–3, 6–4Win 4–5 May 2023Bonita Springs Championship, United StatesW100 Clay Ann Li 6–2, 6–2Win 5–5 Jul 2023Championnats de Granby, CanadaW100 Hard Katherine Sebov 6–4, 2–6, 7–5 Loss 5–6 Oct 2023Tyler Pro Challenge, United StatesW80 Hard Emma Navarro 3–6, 4–6Loss 5–7 Apr 2024Charlottesville Open, United StatesW75 Clay Louisa Chirico 1–6, 5–7Loss 5–8 Jul 2025ITF San Diego, United StatesW15 Hard Tianmei Wang 4–6, 3–6Win 6–8 Aug 2025ITF Southaven, United StatesW25 Hard Ana Sofía Sánchez 6–4, 6–1Win 7–8 Sep 2025Templeton Open, United StatesW75 Hard Kayla Cross 6–2, 3–0 ret.Win 8–8 Jan 2026ITF Le Lamentin (Martinique), FranceW35 Hard Jenny Lim 6–4, 6–2Win 9–8 Feb 2026ITF Orlando, United StatesW50 Hard Katrina Scott 6–4, 6–2Win 10–8 Apr 2026ITF Boca Raton, United StatesW35 Clay Mary Stoiana 6–3, 6–1Loss 10–9 May 2026Zaragoza Open, SpainW75 Clay Jennifer Ruggeri 6–3, 3–6, 6–7(3)Win 11–9 Sep 2026Berkeley Tennis Club Challenge, United StatesW50 Hard Janae Preston 7–5, 6–4
Doubles: 6 (4 titles, 2 runner-ups) LegendW100 tournaments W75 tournaments W25/35 tournaments ResultW–LDateTournamentTierSurfacePartnerOpponentsScoreLoss 0–1 Feb 2017Midland Tennis Classic, United States100,000 Hard (i) Caroline Dolehide Ashley Weinhold Caitlin Whoriskey 6–7(1), 3–6Win 1–1 Feb 2017Rancho Santa Fe Open, United States25,000 Hard Caroline Dolehide Anhelina Kalinina Chiara Scholl 6–3, 1–6, [10–7]Win 2–1 Feb 2019Rancho Santa Fe Open, United StatesW25 Hard Sophia Whittle Eudice Chong You Xiaodi 6–2, 5–7, [10–7]Win 3–1 Oct 2024Edmond Open, United StatesW75 Hard Jaimee Fourlis Sophie Chang Rasheeda McAdoo 7–5, 7–5Loss 3–2 May 2025ITF Boca Raton, United StatesW35 Clay Allura Zamarripa Fiona Crawley Alana Smith 4–6, 2–6Win 4–2 Jan 2026ITF Le Lamentin (Martinique), FranceW35 Hard Jenna Dean Jenny Lim Margaux Rouvroy 6–4, 1–6, [10–7]
Junior Grand Slam tournament finals Girls' singles: 1 (title) ResultYearTournamentSurfaceOpponentScoreWin2016US OpenHard Viktória Kužmová6–3, 6–2
Girls' doubles: 1 (runner-up) ResultYearTournamentSurfacePartnerOpponentsScoreLoss2016US OpenHard Caroline Dolehide Jada Hart Ena Shibahara6–4, 2–6, [11–13]
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