I think Ferrer is good enough that Fed comes focused every time against him, plus it helps when you've played him so many times. Fed might have been surprised by Stack or Donskoy playing way above their normal level. Stack did play a very aggressive style that Ferrer isn't capable of. If I remember right Fed wasn't really all there against Donskoy, looked like he gave about 60% effort.It’s surprising because Ferrer was still decent. Federer is also ‘literally better’ at every aspect of the game than someone like Stakhovsky or Donskoy, but they still beat him, right?
Ferrer has wins over Nadal on clay, yet couldn’t beat Federer, not even on clay. It’s surprising don’t you think?