Just so long as she stays motivated, Garbiñe Muguruza "can do whatever she wants" in the future, Conchita Martínez has said in an interview with wtatennis.com. That includes winning more Grand Slam titles and returning to World No.1 in the rankings.

"If the motivation is there and she puts in some hard work, she can win more tournaments, including Grand Slams, and why not become No.1 in the world again at some point?" said Martínez, whose coaching collaboration with her fellow Spaniard ended just before Easter, with the Wimbledon champion continuing to work with her other coach Sam Sumyk.

"What can she achieve? I think she can do whatever she wants. Garbiñe was an exciting player to coach because she can still learn and improve in many ways. She has already been No.1 and she has even more potential and that's what makes it exciting."

Read more: Conchita Martínez says she will stop working with Muguruza after Miami


Clearly, they parted on amicable terms, so when Muguruza won the title in Monterrey last weekend, her first tournament since the split, Martínez tweeted her congratulations.

Reflecting on their time together, Martínez spoke of the "magical tournament" at last summer's Wimbledon when Muguruza became only the second Spanish woman - the first being her mentor - to score the singles title on the grass.

"Garbiñe and I, we often talked about Wimbledon, because it was a magical tournament and a magical experience that we had together. We often saw pictures or videos and of course you relive the victory over and over again," Martínez said.

"I had many highlights and good times working with Garbiñe but of course the biggest was Wimbledon. My greatest contribution to Garbiñe was during Wimbledon, when I was able to share with her my experience of having won the tournament myself. I also worked on her strength of being a very aggressive player, together with constructing points and what to do in certain moments. I was helping on preparations for practices and matches, bring professional and looking at every detail," she said.

"We had a strong relationship before that, through my job as Fed Cup captain, and after Wimbledon we became closer."

Conchita Martínez with Garbiñe Muguruza at the 2016 French Open

Muguruza's experience of winning majors - her first Grand Slam title came at the 2016 French Open - will only help her in the future. "Of course it is not easy to win a Grand Slam but she has two already and when Garbiñe is focused and playing well she is a very difficult player to beat. She knows what it takes and I'm sure she wants to work hard to lift a big trophy again," Martínez said. "She's a great player and can do many good things in the future."

Martínez is also excited by the return of Serena Williams following the birth of her daughter. "She's such an amazing champion. I have no doubt that she has come back to compete at the big occasions. It may take her a few tournaments [to return to form] but never underestimate Serena," she said. "It's going to be very interesting. Her motivation has to be very high. She is the greatest athlete of all time, and has done amazing things. She's such a great champion and it's been great to see her competing again."