Fritz: "I don't really want to reveal what I've been working on".

After his US Open final two months ago, Taylor Fritz reaches another major tournament final, the ATP Finals.

Asked about his current level and progress, the American didn't want to reveal everything, in order to hide his weaknesses: "First of all, I don't really want to reveal what I've been working on.

I think it would give everyone a better idea of what I was perhaps uncomfortable with, and people wouldn't have realized it.

To cut a long story short, I hit some forehands a lot better than I used to. That's a big change. It's something I've started to work on recently. It was bothering me particularly in matches against the top players.

I'm already seeing big improvements. I'd say that this week, in every match, I'm playing very well. I'm clearly in top form.