Leonard Francois is a Haitian-American tennis coach best known as the father and first coach of Naomi Osaka, the four-time Grand Slam champion and former WTA world number one.
Born in Jacmel, Haiti, Francois later moved to New York before his path took him to Japan, where he met his wife and built the family that would change tennis history.
His story is one of cultural borders crossed, family resistance overcome, and a coaching vision that produced one of the most decorated players in the sport.
Who is Leonard Francois?
Leonard Francois is a Haitian-American tennis coach and the father of professional tennis players Naomi Osaka and Mari Osaka. He introduced both daughters to the sport from the time they were toddlers and served as their primary coach through their formative years.
His coaching approach drew direct inspiration from Richard Williams, the father who trained Venus and Serena Williams. After watching the Williams sisters dominate the 1999 French Open, Francois committed to replicating that model with his own daughters.
Naomi Osaka went on to win four Grand Slam titles: the US Open in 2018 and 2020, and the Australian Open in 2019 and 2021. She also reached the world number one ranking in the WTA singles rankings, becoming the first Asian player to achieve that distinction.
Leonard has been a consistent presence throughout Naomi’s career. He returned as her head coach in August 2022 after she parted ways with Belgian coach Wim Fissette.
Naomi credited him with helping her think positively under pressure, saying at the time, “Whenever I think something is really bad he always makes me realise that things are much more positive than they seem.”
As of 2026, Leonard and his wife Tamaki Osaka attended Wimbledon to cheer Naomi from the stands as she defeated Aryna Sabalenka and advanced to the quarterfinals.
Early Life of Leonard Francois
Leonard Maxime Francois was born in Jacmel, a coastal city in the southern part of Haiti. He grew up in a country with limited resources, and his family placed a strong emphasis on education and hard work.
As a young man, he relocated from Haiti to New York City to pursue higher education. He attended college in New York, though the specific details of his degree remain unknown.
His move to the United States exposed him to a broader world of culture and sport. Those experiences in New York shaped the global perspective he later brought to raising and coaching his daughters.
Before starting his family, Francois spent time in Japan, where he would meet his future wife and begin a life that took him from Haiti to Osaka and eventually back to the United States.
Leonard Francois Age
Leonard Francois’s exact birth date has not been publicly confirmed. Based on contextual details across multiple sources, his birth year falls in the 1970s or early 1980s, placing him in his mid-40s as of 2026.
His daughter Mari was born in 1996 and Naomi in 1997.
Leonard Francois Ethnicity and Nationality
Leonard Francois holds Haitian-American nationality, having been born in Haiti and later relocating to the United States. His ethnic background is Black African, rooted in his Haitian heritage.
He has spoken about his Haitian identity through his daughter Naomi, who has publicly expressed pride in both her Haitian and Japanese heritage.
Naomi has described Haitian people as “really positive” and credited that cultural trait to her father’s side of the family.
Leonard Francois Height and Weight
Leonard Francois stands at 6 feet tall, which is equal to approximately 1.83 meters. His weight has not been publicly confirmed.
Leonard’s physical appearance is described across multiple sources as having dark brown eyes and black hair.
His athletic build reflects a lifelong interest in sports, including soccer, basketball, cycling, and running, activities his wife Tamaki Osaka described in a published account of their family life.
Leonard Francois Education
Leonard Francois completed college-level education in New York, where he studied after relocating from Haiti. The specific university and subject of his studies have not been publicly confirmed.
Despite having no prior formal training as a tennis coach, he educated himself in the sport through videos and observation.
His self-taught coaching approach mirrored the methods of Richard Williams, who also had no professional coaching background when he began training his daughters.
Leonard Francois Career
Leonard Francois built his entire coaching career around his two daughters. He did not pursue tennis professionally before becoming a coach, nor did he hold a formal coaching position at any club or academy. His career is inseparable from the development of Naomi and Mari Osaka.
His coaching philosophy centered on discipline, repetition, and mental resilience. He trained his daughters to serve big and hit hard from every part of the court.
The Inspiration and Early Training
The turning point came during the 1999 French Open, when Francois watched Venus and Serena Williams dominate the tournament. Venus and Serena were 18 and 17 at the time, and Francois’s daughters Mari and Naomi were still toddlers. Yet he decided that night to follow the blueprint Richard Williams had created.
After the family moved from Japan to the United States and settled on Long Island, New York, he began training Mari and Naomi in earnest. Mari was four and Naomi was three when the sessions started. He taught them how to serve big and strike the ball hard from anywhere on the court.
Tamaki Osaka, his wife, worked demanding jobs to support the family financially throughout this period. Naomi has recalled her mother sleeping in her car at times to cover the costs of training and travel.
Training in Florida and the Pembroke Pines Courts
Leonard soon realized that Long Island did not offer the facilities or competition his daughters needed to develop further. In 2006, he relocated the family to southern Florida, following the same geographic logic that had guided Richard Williams when he moved Venus and Serena to Florida in 1991.
In Florida, Francois trained his daughters daily at the Pembroke Pines Public Courts. He kept to a rigorous routine: daytime court sessions focused on technical repetition, while evenings were devoted to home-schooling.
Rather than enrolling Mari and Naomi in conventional school, he taught them academics at home so their tennis development could stay on schedule.
He continued this regimen for seven years in Florida. By 2013, he recognized the girls needed professional coaching beyond his capacity.
Naomi, then 15, enrolled at the ISP Academy under coach Patrick Tauma and also trained at the Florida Tennis SBT Academy and the ProWorld Tennis Academy.
Coaching Role with Naomi’s Professional Career
Even after Naomi began working with professional coaches, Leonard remained a constant presence. He served as her primary coach through the 2018 season, the same year she won her first WTA title at Indian Wells and her first Grand Slam at the US Open.
In 2019, Naomi parted ways with coach Jermaine Jenkins, and Leonard stepped in again on an interim basis. She later moved on to other coaches, including Wim Fissette, who guided her to the 2020 US Open and the 2021 Australian Open titles.
In August 2022, Naomi split from Fissette and brought her father back as head coach again. She described his coaching style as “simple” and praised his ability to shift her mindset during difficult moments. His return coincided with her match at the Silicon Valley Classic, where she defeated Zheng Qinwen in three sets.
Leonard and Tamaki were both present at Wimbledon 2026, cheering from the stands as Naomi defeated Aryna Sabalenka on July 5 to advance to the quarterfinals.
The Australian Open has also featured Leonard prominently, with the tournament itself publishing a profile highlighting his role as the man who “instilled an early belief” in Naomi’s potential.
Leonard Francois Wife
Leonard Francois is married to Tamaki Osaka, a Japanese woman from Nemuro, Hokkaido, Japan. The two met in the early 1990s in Sapporo, the capital of Hokkaido, when Leonard was visiting Japan as a college student and Tamaki was still in high school.
Japan had only recently allowed the first wave of foreign visitors when the two crossed paths. Their relationship quickly became serious, but the cultural climate in Japan at the time made their bond difficult to sustain openly. Biracial relationships carried significant social stigma, and Tamaki’s family held conservative views on the matter.
The couple kept their relationship private for years. When Tamaki eventually disclosed her relationship to her father, he accused her of bringing shame on the family. Her family did not approve of the match, and Tamaki faced isolation from her relatives as a result.
Despite the opposition, Leonard and Tamaki married and relocated to Osaka, the city in Japan after which Naomi would eventually be named. They lived there for close to five years, during which Tamaki had almost no contact with her own family.
The two daughters were born during that period: Mari in April 1996, and Naomi on October 16, 1997.
Because of Japan’s Family Registration Law (Koseki), the girls adopted their mother’s surname, Osaka, which made it practical for schooling and administrative purposes in Japan.
In 2001, the family moved to Long Island, New York, to live with Leonard’s parents and to begin serious tennis training for the girls. Tamaki’s family finally reconciled with the couple when they returned to Japan in 2008.
Leonard and Tamaki remain married and have attended major tennis tournaments together as a couple, including the Osaka Foundation Benefit in New York City on August 21, 2025, and Wimbledon 2026.
Leonard Francois Children
Francois and Tamaki Osaka have two daughters: Mari Osaka, born on April 3, 1996, and Naomi Osaka, born on October 16, 1997. The sisters are 18 months apart in age.
Mari Osaka pursued a professional tennis career and has competed on the WTA Tour. She has won prize money on the professional circuit, though she has not achieved the same level of rankings as her younger sister.
Naomi Osaka became a four-time Grand Slam champion and reached world number one in the WTA singles rankings. She is the first Asian player to hold the top spot in singles.
Naomi returned to the tour in January 2024 after giving birth to her daughter Shai, and in 2025 she returned to strong competitive form, reaching the third round of Wimbledon 2025 before losing to Anastasia Pavlyuchenkova.
In July 2026, she advanced to the Wimbledon quarterfinals after defeating Aryna Sabalenka on July 5.
Leonard has credited his family environment in Japan for helping shape the mental toughness that Naomi brings to the court.
Even after her losses, he has helped her maintain perspective, as Naomi described in a 2025 Instagram post following her Wimbledon exit that year.
The Bottom Line
Leonard Francois coached Naomi Osaka from age three to her first Grand Slam title at the 2018 US Open, working with her at public courts in Florida for years before she turned professional.
His blueprint for developing a champion without formal coaching credentials followed directly from Richard Williams’s model with Venus and Serena.
Born in Jacmel, Haiti, and shaped by two continents, Francois built a bicultural family that defied serious social resistance in Japan to allow both daughters to compete at the highest level of professional tennis.
His marriage to Tamaki Osaka survived more than 15 years of family estrangement before the two sides reconciled in 2008.
As of 2026, Leonard continues to be a visible presence at Naomi’s major tournament appearances, supporting her from the stands at events including Wimbledon 2026. We hope you enjoyed reading about Leonard. Feel free to share your thoughts in the comments below!