Kayla Day Bio
Kayla Day (born September 28, 1999) is an American professional tennis player from Santa Barbara, California. She is recognized for her left-handed play and two-handed backhand, and has built her career on the ITF Women’s Circuit and the WTA 125 Challenger Tour, with appearances at the WTA Tour level. Her highest singles ranking on the WTA Tour is world No. 84, a milestone she reached on April 1, 2024. As a junior, she captured the 2016 US Open girls’ singles title, announcing herself as one of the most promising young American players of her generation.
Standing 1.73 m (5 ft 8 in) tall, Day is currently based in Lake Nona, Orlando, Florida, where she continues to train and compete. She has been guided throughout her career by coach Pat Cash and has accumulated career prize money of US$1,395,371. With more than 290 match wins on the professional circuit, she has steadily developed into a consistent competitor on the international stage.
Kayla Day Career
Early Career (2016-2018)
Kayla Day made her WTA Tour debut at the 2016 Connecticut Open in New Haven, where she entered the main draw as a lucky loser after defeating Naomi Broady and Kirsten Flipkens in qualifying. The following week, she played her first career Grand Slam at the 2016 US Open, where she won her opening match against compatriot Madison Brengle. She also reached the second round of the doubles draw at the same tournament, partnering with Caroline Dolehide.
Shortly after turning 17, Day won her first professional title at a 50k event in Macon, Georgia, and followed it up with a semifinal run in Scottsdale that pushed her into the WTA’s top 200 for the first time. Her combined results at those two events earned her the Australian Open Wild Card Challenge title, securing a place in the main draw of the first Grand Slam of 2017. She officially turned professional in 2017 at the Australian Open and later that season recorded her first WTA Premier Mandatory wins at Indian Wells, including a victory over 2017 Australian Open semifinalist Mirjana Lučić-Baroni.
WTA 125 and Challenger Breakthrough (2022-2023)
After nearly five years away from the WTA 1000 level, Day returned to the top tier of the tour at the 2022 Guadalajara Open, where she qualified for the main draw before falling to Eugenie Bouchard in the first round. The appearance marked an important step back into higher-level competition following years of grinding on the ITF Circuit.
In 2023, Day enjoyed her most significant run at a Grand Slam tournament, winning three qualifying matches to reach the main draw at the French Open. She defeated wildcard Kristina Mladenovic and 20th seed Madison Keys to advance to the third round at Roland Garros, where she was ultimately stopped by Anna Karolína Schmiedlová. Later in the season, she claimed the title at the Championnats de Granby in Canada, defeating Katherine Sebov in the final to climb to a then-career-high ranking of world No. 94 and break into the top 100 for the first time.
WTA Tour Establishment (2024-2026)
Day began 2024 with a first-round loss at the Australian Open, but quickly rebounded at the Indian Wells Open, where she entered the main draw as a lucky loser replacing fourth seed and defending champion Elena Rybakina. Although she lost to Nadia Podoroska in her opening match, the appearance contributed to her rise to a career-high ranking of No. 84 on April 1, 2024. She exited the 2024 French Open in the first round against Hailey Baptiste, but continued to compete regularly on both the WTA Tour and the ITF Circuit.
In September 2025, Day won her seventh professional singles title on her 26th birthday at the Central Coast Pro Tennis Open in Templeton, California. She continued her upward trajectory in 2026, qualifying for the Indian Wells Open and defeating Francesca Jones in the first round before being eliminated in the second round by second seed Iga Świątek. As of mid-2026, her current WTA singles ranking stands at No. 136.
Notable Events and Milestones
Among the most defining moments of Day’s career are her 2016 US Open girls’ singles title, her 2023 French Open third-round run, and her career-high ranking of No. 84 in April 2024. Her first WTA Premier Mandatory win over Mirjana Lučić-Baroni at the 2017 Indian Wells Open also stands as a notable early milestone. Most recently, her victory at the 2025 Central Coast Pro Tennis Open on her birthday highlighted her continued competitive drive.
Kayla Day Career Wins
Kayla Day has accumulated 10 ITF singles titles and 4 ITF doubles titles across her professional career, with a career singles record of 293-212. While she has yet to lift a WTA Tour trophy, her consistent results on the ITF Circuit and Challenger level have established her as a reliable competitor. Her highest doubles ranking of No. 133 was reached in January 2018, while her singles peak came more than six years later in April 2024.
ITF Circuit Highlights
Day’s first professional title came at a 50k tournament in Macon, Georgia, in 2016, which launched her rise into the WTA’s top 200. She has since built a steady collection of titles across the ITF Circuit, with her most recent victory coming at the 2025 Central Coast Pro Tennis Open in Templeton, California, on her 26th birthday. She has also recorded several deep runs in WTA 125-level events, including her title at the 2023 Championnats de Granby.
Other Wins and Performances
Day’s most prestigious singles result outside of ITF events is her third-round run at the 2023 French Open, which remains her deepest Grand Slam performance to date. She has also made the second round of the US Open in 2016 and qualified for multiple WTA 1000 events, including Indian Wells and Guadalajara. In doubles, her second-round showing at the 2017 US Open with Caroline Dolehide represents one of her strongest results at a major.
Kayla Day Family
Family Background and Racing Lineage
Kayla Day began playing tennis at the age of seven, and her mother hails from the Czech Republic, giving Day a mixed American-European heritage. She has been coached from the beginning of her career by Larry Mousouris, who also mentored other Junior US Open winners Michael Falberg and Tim Trigueiro.
Personal Life
Day was born and raised in Santa Barbara, California, before relocating to Lake Nona, Orlando, Florida, where she currently resides and trains. She is known publicly primarily for her tennis career, with limited confirmed details about her personal relationships.
2025 Season Performance
The 2025 season was a productive year for Kayla Day on the ITF Circuit, highlighted by her seventh professional title at the Central Coast Pro Tennis Open in Templeton, California, won on her 26th birthday in September 2025. She continued to compete regularly across both ITF and WTA-level events, working to maintain a presence inside the top 150 of the WTA rankings.
Throughout 2025, Day balanced Challenger and WTA Tour appearances, using the ITF Circuit as a foundation for larger events. Her experience and ranking allowed her to qualify for several main draws at higher-level tournaments, further developing her match experience against top-ranked opponents.
Heading into 2026, Day qualified for the Indian Wells Open and secured a first-round win over Francesca Jones before exiting in the second round to Iga Świątek, one of the top players in the world. With her ranking at No. 136 in June 2026 and her game continuing to mature under coach Pat Cash, she remains firmly on the radar as a player capable of breaking deeper into the WTA’s elite tier.
