As a tennis player, or any professional athlete, our career has a shelf life. I don't want to waste any opportunities, I don't want to look back on it when I'm 45 and think I could have done a lot more.

I didn't know I could even be a professional tennis player, honestly. All this is actually very, very unexpected.

A lot of times when I'm confident and relaxed on the court, I'm going to be a pretty tough out. But when I'm not so confident and not so relaxed, I tense up and my balls fall short and everything. It just sort of unravels.

In the past, I've played where I only just rely on my serve.

If I had any advice to give people, it would be to relax; never treat an audition like an emergency. There will be plenty more in your career. If you think you messed up, you probably didn't. And if you did mess up, it's not the end of the world.

Playing a cop goes a long way. I have a lot of friends who are working as actors, and as soon as I started playing military characters or cops, and not the actual criminal that we're chasing on this show, they all said, 'You actually can have a career now.'

You can be an idiot and survive because you just go to McDonalds for your food, and you go to work and do some sort of inane job, which is nobody taking any responsibility - it's always up the line - and then you watch the Super Bowl, and that's it. But in the old days, you really had to know how your world works. You don't need that anymore.

With the amount of flops that I have seen in my career, one would think that my career would have been over long back. But it has sustained. And I truly believe it did because I lived life on my own terms.