John Isner vs Kei Nishikori prediction

Head to Head between them was 1-1, their latest meeting was won by Kei Nishikori 46 64 64, in Washington 2015. Kei Nishikori had 8 won in last 10 matches and 9/3 record on hard; whilst John Isner had 7 won in last 10 matches, with 6/2 record on hard. Kei Nishikori had serious fight from Steve Johnson which is ended in 76 76 in his previous game, while John Isner won over Andreas Seppi & Adrian Mannarino in similar number of game (76 64). I predict their next clash will had similar result as their previous meeting, has a tie a break, and produces more than 25 games.