“My relationship with my family wasn’t great a few years ago because I was always away and didn’t have my family around me,” the Australian added.
“I was winning, losing, going through relationship problems, dealing with other problems and I was pushing them away because you feel like the world’s against you.
“I pushed everyone who was close to me away and I fell out with people and that’s something I’d never want again.
“That’s why tennis is so hard, in my opinion. The mental game is ridiculous.
“Physically, you have to be an absolute animal. What other sport do you have to play for three-plus hours, possibly seven times in two weeks? It doesn’t happen.
“I’m pretty sure that’s why I lost my f***ing marbles.”
source: express.co.uk