What you need to do is, like some other people pointed out, look for the locations of the pop-ups and not what they say. That is, W will always appear above the fighters, A to the left, D to the right and A below.
So you keep your eyes open for the locations of the prompts rather than the content of them, and you're pretty much set.

This makes it extremely easy, even with Hard QTEs. I think I got hit twice during boxing in my entire playthrough, and I did all of the matches that I could find.