Naomi Osaka and Patrick Mouratoglou have parted ways after less than a year of working together, and the four-time Grand Slam champion will now work with Tomasz Wiktorowski on a trial basis.

Japan's Naomi Osaka, a four-time Grand Slam singles champion, will work with Polish coach Tomasz Wiktorowski on a trial basis after splitting with Patrick Mouratoglou after less than a year together.

So far, the early results are promising for the budding partnership between Osaka and Wiktorowski. Osaka defeated Ariana Arseneault in the first round of the WTA 1000 Montreal yesterday. However, Osaka will face much stiffer competition in the 13-seed Liudmila Samsonova tomorrow. Currently, Osaka is the World No. 49 with a record of 22-11.

Naomi Osaka reveals she initially thought Tomasz Wiktorowski was "stern," but now sees him as a funny person and also someone who knows exactly what he is doing.

Naomi Osaka's coaching experiment with Tomasz Wiktorowski is already showing promise. The four-time Grand Slam champion began her new partnership this week at

Osaka's time with Mouratologou followed an up-and-down sequence of promising signs and frustrations with either injury or close-run defeats.

Patrick Mouratoglou has opened up about what led to Naomi Osaka parting ways with him just over a week before the Canadian Open. The split came at the back of her round of 16 loss to Emma Raducanu at the ATP 500 tournament in Washington,

Patrick Mouratoglou believes Naomi Osaka’s competitive nature was ‘missing’ during their partnership in his first interview since their coaching split. Acclaimed coach Mouratoglou and four-time Grand Slam champion Osaka parted ways at the end of July Osaka and Mouratoglou parted ways on good terms,