Immense stuff. Isner likes a good marathon match, doesn't he? Though as good as it is, fifth sets really should go to a tiebreak at some point, like at 15-15.
It should be a tiebreaker after 6-6 in the 5th, A toss up to see who gets the first serve before switching to the standard alternating of 2 consecutive serves after that first point has been played. Today's situation was crazy. Anderson must be knackered and Rafa & Novak having to wait so long, and possibly restart again tomorrow will reduce the quality of the final on Sunday.