Pressel, who tied for second place at this year's U.S. Women's Open, advanced thanks to a 3 and 1 victory over Angela Park. Martinez moved into the final with a 4 and 3 thrashing of Alison Whitaker at the Settindown Creek Course at Ansley Golf Club.
Pressel found herself 1-down after Park eagled the fourth, but Pressel rebounded with a 12-foot birdie putt at the next to square the match. Pressel went ahead with a 15-footer for birdie at six, but a bogey at eight brought the pair back to even for the match.
The 10th proved to be the decisive hole as Pressel holed out from 92 yards with her third shot at the par-5 . She won that hole, then the duo halved the next five holes.
'When I hit it, some guy standing behind me was like, 'Oh, go in, go in,' and it was just taking off. I'm like, 'What are you talking about?'' said Pressel, referring to her eagle at 10. 'It was just an added bonus.'
Pressel rolled in a five-foot birdie putt at the 16th to go 2-up. She sank a 15-footer for birdie at the next to end the match and punch her ticket for the final.
'I played really well this week and the only thing more that I could ask for is the trophy,' said the 17-year-old Pressel, who unsuccessfully lobbied the LPGA Tour to change their 18-year-old minimum age restrictions so she could play next year.
Pressel's opponent, the 21-year-old Martinez, was 1-down twice early in the match, but took control with a 12-foot birdie putt at the sixth to go 1-up herself. She extended the lead to 2-up with a 15-footer at the ninth.
Whitaker won 10 to cut the margin, but Martinez took the 12th with par to reclaim her 2-up advantage. Whitaker made a mess of 13 and conceded the hole to Martinez, who never got a chance to putt her 10-footer.
The match was over two holes later when Whitaker could not make par at the 15th.
'I'm pretty confident in my game right now, I've been working very hard, especially on my putting, and it's just a matter of making putts tomorrow,' said Martinez. 'Hopefully they will go in.'