The world No. 6 said: “I am missing a bit of the motivation I had before. When you have been No. 1 in the world it is not so easy.
“It is a constant battle against yourself. You need to be disciplined so that when you want to eat chocolate you say no to yourself.
“You have to force yourself to go out and practise for four or five hours a day. For that you need to be strong.
“There is lots of playing and travelling and that is not easy. Every player has their ups and downs but when you are not doing well those are the times you need to work hard and come out of it stronger.
“I need a break and maybe not playing for a little bit will get me to the point where I want to play tennis again and want to run after those balls because that is missing at the moment.
“I will play Wimbledon and then after that we will see what I will do.”