Ah well, it was a nice try. But if he will mispronounce his own name (although it would be "F" in German ordinarily), well, all Phauer to him!
Yes, it was, it most certainly would be & you may even have been right the first time, Specatator. It all depends whether he's "Germanised" the pronuniciation of his surname. It appears that his mum's German, while his dad is Indonesian, which accounts for the "Pow" version. I don't think I've ever heard his name spoken out loud. I've always read it as "Fow" in my head. It never even occurred to me that it could be "Pow", so until there's reliable proof to the contrary, shall continue to think of it that way.
I give no credence whatsoever to the ATP's so-called guidance. It can't even get the now exalted Stan Wawrinka's name right (it appears to ignore the existence of an "r" after the second "w"!) & I'll lay a pound to a penny that its suggestions are heavily infuenced by what those appallingly ignorant (when it comes to anything foreign language-related) Yanks think it should be!
I have heard it out loud, with German commentators, and they said "Pow". At the time I thought it odd and checked up on the ATP site, that's why I picked up on it.Of course they may have been following the ATP's guidance!