Tennis has given me so many opportunities, and I feel very lucky to have achieved whatever I have, especially coming from a country that does not have a great history in the game.

Coaches were all saying that I was really talented and I had potential, but coming from Serbia, it wasn't easy. The '90s were the hardest years for our country - we went through two wars.

Everyone wants to be happy - people find happiness in different ways. While you want to pursue your career 100 percent, I think it is very hard to give 100 percent in something else. It's important to find this balance, and priorities change throughout life.

I think it's better not to mix professional life and personal life - although it is hard.

There isn't a right or wrong way to be depressed, anxious, or struggle with PTSD. Mental health challenges manifest differently for different people, and it's important that people see that on-screen.

Weight-bearing exercise builds bone density, builds your muscular strength so that you can hold your body up where those bones have a tendency to get weak.

There's a lot of talent out there with just the normal physique. The 'cross-fit' type physique - that's the new exercise that took over.

If you want to know why Republicans and conservatives are in a political crisis, you need only consider the fact that the Right's deeply held view now boils down to this: Taxes should not go up on the wealthy, and your health benefits should be cut.