After being 1 down heading to the 13th hole, the 17-year-old South Korean won four consecutive holes to close out a 3-and-2 victory against Fresno State sophomore Bhavik Patel today.
Martin took a 4-up lead through six holes as Texas senior Charlie Holland got off to a sloppy start, and he cruised to a 5-and-4 victory.
An and Martin will meet in a 36-hole match play final Sunday at Southern Hills Country Club, the site of the 2007 PGA Championship.
U.S. Amateur finalists have traditionally earn invitations to play in the Masters Tournament the following year.