Gulbis served for the second set, lost it. Kuku was up *5-1 40-0 in the third set and didn't win another game until falling down a break in the fourth. Gulbis started the fifth set with a break of serve, had BP for a double break at 2-*0, didn't take it and lost his break lead. Had an opening on return at 4 all to potentially break getting to deuce, failed to take advantage and got broken at love to lose the match.
Two very similar players, two guys who are mentally fragile, unfortunate Gulbis couldn't find a way to close things out. This loss will hurt.