No, like I said, my dad was never really part of the tennis. His involvement around what I did with the tennis and with my mom and my grandparents was really not a part of my life.

I've hung out at dozens of playgrounds, bored out of my mind, with not even a look of comfort from disapproving mothers all around me. Either they think I'm a pedophile or a deadbeat dad. That's what I get for being a single dad - suspicious looks at the playground.

My mum's parents were from Ireland, my dad's mum was American-Irish.

Obviously, losing a parent is very difficult. I miss my dad every day, but I know he would be proud to see me continuing to swim and going for another shot at the Olympics.

I actually study boxing - my dad was a Golden Gloves champion so I learned how to fight at a very young age. Growing up in Brooklyn you always had to watch your back, so I pretty much learned to protect myself.