Naomi Osaka has parted ways with Patrick Mouratoglou after a 10-month partnership that didn’t yield the results either would have hoped for. The four-time Grand Slam champion will now look for a coach who can help her rediscover the form that once made her one of the most feared players on the WTA Tour.Osaka is a four-time Grand Slam champion and former World No. 1 who dominated the hard courts from 2018 to 2021. She won the US Open in 2018 and 2020, and the Australian Open in 2019 and 2021. Coached previously by Wim Fissette, Osaka rose to the top of the rankings through her power and mental strength. She then took an extended break, giving birth to her daughter, Shai, in July 2023. Osaka returned to competition in January 2024, carrying hopes of reclaiming her form and competitiveness. In September 2024, she joined Patrick Mouratoglou’s team, hoping to reignite her best tennis. Under him, Osaka reached her first final since 2021 in Auckland, but retired mid-match due to an abdominal injury. She also claimed victory at a WTA 125 event in Saint-Malo.Despite these flashes of success, consistency eluded Osaka and she suffered several early exits. The Japanese seemed to lack the spark on her groundstrokes and often faded from matches she should have dominated. After the eventual split, here's a look at four coaches who could help Naomi Osaka regain that past glory.Brad Gilbert: Can he get Osaka back to Grand Slam glory?Brad Gilbert coaching Coco Gauff at the 2024 US Open - Source: GettyWhen Brad Gilbert joined Coco Gauff's team in mid-2023, results followed fast. Under his guidance, Gauff won Washington, Cincinnati, and that year’s US Open, her first Grand Slam title. She also climbed to a career-high No. 2 in the world.Gilbert is respected for his work, having coached Andre Agassi to six Majors and Andy Roddick to US Open glory in 2003. Agassi even labelled Gilbert one of the 'greatest coaches' of all time. Gilbert and Gauff's partnership ended after a disappointing US Open defence in September 2024. But the 63-year-old remains active in tennis commentary and analysis, visible on platforms like ESPN and X. His sharp tactical mind and Grand Slam-winning resume could offer Naomi Osaka valuable structure and belief, especially given her search for consistency and confidence. Gilbert's ability to bring out the best in talented players could be a perfect match for Naomi Osaka's next comeback chapter.Rennae Stubbs: The wise head Naomi Osaka could use to back herRennae Stubbs coaching Serena Williams at the 2022 US Open - Source: GettyRennae Stubbs has a rare blend of Grand Slam experience, coaching credibility, and belief in the WTA's future. These qualities could reignite Naomi Osaka's career.Stubbs was once the World No. 1 in doubles, winning six Grand Slams and 60 titles overall during a decorated career. She has coached elite players, including Karolína Pliskova, Eugenie Bouchard and Samantha Stosur. Stubbs helped Pliskova reach the Australian Open semifinals and Bouchard climb from No. 330 to No. 120 in the world rankings.Perhaps most notably, she served as Serena Williams' trusted advisor during the American's farewell campaign at the 2022 US Open. Williams herself brought Stubbs into her team for support and match preparation, and Chris Evert praised the move.Stubbs remains highly visible in tennis as an active commentator for ESPN and host of a podcast. She is a vocal advocate for women in coaching and on the WTA circuit. For Naomi Osaka, who needs not just tactical insight but also emotional support, Stubbs would offer stability, empathy, and tennis knowledge.Goran Ivanisevic: Risky project, but it could be exactly what Naomi Osaka needsGoran Ivanisevic coaching Stefanos Tsitsipas at The Championships - Wimbledon 2025 - Source: GettyGoran Ivanisevic has exceptional coaching credentials in tennis. He helped Novak Djokovic win 12 Grand Slam titles between 2018 and 2024. Known for transforming Djokovic’s serve into an elite weapon, Ivanisevic knows how to prepare a player for the biggest stages.His brief stints with WTA stars Elena Rybakina and Stefanos Tsitsipas lasted just months, ending amid tension and poor results. That raises concerns about his long-term commitments.Still, Naomi Osaka could be the one project that convinces the Croatian coach to stick around. He thrives with big hitters who need tactical and mental guidance. If Osaka is ready to buy into his demanding style, he could sharpen her serve and court presence.Renzo Furlan: The underdog coach who raised a championRenzo Furlan coaching Jasmine Paolini at the 2025 United Cup - Source: GettyRenzo Furlan is not a household name, but he earned WTA Coach of the Year honours in 2024 after guiding Jasmine Paolini to a breakthrough season. Paolini rose up the rankings, claimed multiple titles, and developed a powerful game well into her mid‑20s. Furlan helped her transform into a legitimate Major contender. View this post on Instagram Instagram PostAs a former top 20 player himself, he could help Naomi Osaka with his detail‑oriented approach, especially when it comes to managing pressure. Furlan may lack Grand Slam fame, but he brings consistency, belief, and expertise in development.