Harman will face Sihwan Kim on Friday. Kim parred the 17th hole in his match against Tyler Obermueller en route to 1-up victory.
Now Harman has a chance to make history if he is able to hang on until Saturday afternoon's championship match. Harman could be the second player ever to win back-to-back titles. The other was Tiger Woods from 1991-93.
'It's getting a lot tougher and a lot of people are looking to beat me,' said Harman, a left-hander. 'I don't like to lose, and I want to take that trophy back home.'
Juan Pablo Candela needed an extra hole to dispatch Kyle Takesue, 1-up. Candela will face Jon Curran in Friday's quarterfinal. Curran moved on with a 7-and-6 thrashing of Kevin O'Connell.
David Chung won, 1-up, against Matt Savage and will take on Robert Riesen next. Riesen bested Robby Ormand, 2 and 1, in the third round.
Sung Hoon Kang defeated Bradley Johnson, 2 and 1, and now has a date with Timothy McKenney in the quarters. McKenney topped Erik Flores, 3 and 2.