Karlovic, judging by the way Fed's been playing lately. Zero confidence.
His match of today might just have given him what he needed in that area, but as I see you are a total bandwagonner, I'm not surprised at your post at all.
Will be a tough match, two players with a Big Serve (yes, Roger served 21 aces today
) - so... TB time.
Hopefully, Roger in two, but realistically... I honestly don't know. The only thing I do feel confident about is that the final score will involve a lot of 7:6's.