I definitely agree about the future of youth football being flag. There's just more and more evidence that the youth brain is particularly susceptible to the injury - thin necks, big heads. They're not as coordinated; they're not as skillful. For many reasons, I think the wave of the future is flag football for youth.

I was born with football - my brothers, my dad. I played football when I was a kid. I mean, you know, it was part of life. It's a part of growing up. It's - you know, it's a way of life.

My greatest hope is that we learn how trauma induces neurodegeneration in susceptible individuals.

My son was a goalkeeper in soccer, and he luckily never had much head trauma. He never had any concussions or anything. I really wanted him to play football, but now I'm thankful he didn't.

It was always academic first, and I always put school work before football - although I did put a lot into football!

Going to the Portland Trail Blazers, who actually took the time to invest in me, was perhaps the best thing that ever happened to me in my career. I got to a small market where I could focus on basketball, basketball, basketball. No distractions.

Personally, just being able to compete in an Olympics, being part of an Opening Ceremony wearing a green jacket with the rest of the Australian Olympic team, would be a more than a dream come true.

If you are happy in your private life, and - that will affect your tennis, and that will help you, actually.