I did not regret any single thing I have done in my life in the past since the day I was already conscious of what I was and am doing, nor the things I have not done. Regretting is lame. I believe in myself, and so in God's mercy and forgiveness. ↗
But I certainly made mistakes, for which I regret, I think most human beings in their lifetime make mistakes, mine ended up in two years prison - two very remarkable years from which I learnt a lot. ↗
I have many regrets, and I'm sure everyone does. The stupid things you do, you regret... if you have any sense, and if you don't regret them, maybe you're stupid. ↗
I had a great tennis career. I have no regrets. But to find peace with yourself, and to finally be with your family - I'm probably the happiest guy in the world. ↗