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"The truth is that what I feel right now is that instead of taking steps forward, I’ve taken steps back in terms of my head and I don't understand why," he said.

"Because I came from a spectacular summer, from Roland Garros, from Wimbledon, coming out of there saying that mentally I had taken a step forward, like I had realised that to win big things or Grand Slams you had to be mentally tough. I come to this tour and it’s like I’ve taken steps back.

"It’s like I’m not well mentally. I’m not well, I’m not strong.

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