'Naomi Osaka can win Roland Garros and Wimbledon,' said Navratilova

The young gun Naomi Osaka has already won four Major titles, conquering a couple of Australian Open and the US Open titles within a few years to write history.

The Japanese is yet to find her A-game at Roland Garros and Wimbledon, winning only ten out of 17 matches at two European Majors, as she still can't master the slowest and the fastest surface. Naomi is yet to reach the fourth round in Paris and London, and Martin Navratilova believes that could change soon, praising Osaka and her abilities, especially on grass, where she can hit big and aggressive strokes.

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"The potential is there, no doubt about it. The surfaces are much more similar than they used to be. Grass is slower, clay is faster, the balls are faster. You don't have to make nearly as much of an adjustment as you used to. I don't see Naomi being that confident with her sliding. But then, Andre Agassi won the French Open without sliding; it can be done. But it just makes life easier when you slide, and you're comfortable with timing with your strokes.

There's no doubt that she has the game to win both on the clay and the grass. I think she's still learning when to pull the trigger on the clay. Grass, there is no reason for her not to dominate on the fastest surface, as well. The kick serve is great for grass. It's magnified by bad bounces, the kick. Her big shots pay off better on grass than the other surfaces, other than maybe a fast court like in Australia this year. The sky's the limit.

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It's just a matter of putting in the time and getting more instinctual on the surface, that's all. Especially grass, because you only have that one tournament. Maybe she needs to get on the grass during the year, not just before Wimbledon, to get more comfortable with it, so it's like coming home. We used to have two grass-court seasons, in Australia and at Wimbledon in Europe.

You had like two months on the surface, so six weeks. Now they have two to three weeks on it, and it shows up. They're not that comfortable on it. She needs the mileage on it. Game-wise there's not that much of an adjustment to make," Martina Navratilova said.