We all know that Isner will be holding his serves but the question is can Berankis push this to a possible tiebreak or 3rd set..........I believe he will. Berankis notched a huge victory against Haas and I believe this clay surface will lengthen the match long enough for him to push this over the total.
If Berankis can get settled in early and notch some games under his belt, there will be an excellent chance for a tiebreak and this match will go over.
Best of Luck