John Isner vs John Millman prediction

John Isner is leading 1-0 on their head to head record. John Isner had 6/10 form and 2/4 record on clay; and John Millman had also 6/10 form and no record yet on clay. Clay is not suit for both players who rely on big serves, since high bounce ball makes easier to return; however Isner’s big serves of course reliable. I predict there will be more than 37.5 games will produces here; since it wont be easy for Isner to beat Millman.