Nirapathpongporn advanced thanks to a 3-and-1 victory over In-Bee Park at Philadelphia Country Club. Jane Park made it to the final with a 2-and-1 win over Paula Creamer in Saturday's other semifinal match.
Nirapathpongporn fell 2-down early because of a bogey at the first and a birdie by In-Bee Park at No. 2. Nirapathpongporn clawed back into the match and squared the contest when she was conceded birdie at the par-5 sixth.
From that point on, Nirapathpongporn was in command. She birdied the seventh to go 1-up then won nine and 11 with pars to go 3-up. In-Bee Park won the 16th to cut the deficit to 2-down with two to play but she bogeyed No. 17 to give Nirapathpongporn her first appearance in the final.
'It's not exactly where I want to be but on my way,' said Nirapathpongporn, who has been a quarterfinalist the past two years. 'But I know there is one more task left to be done, to be accomplished.'
Jane Park lost the second hole to a Creamer birdie but rebounded. She parred the fifth to draw even and took a 1-up advantage at the par-3 seventh when her 6-iron tee ball rolled five feet from the cup and Creamer conceded the hole.
At the eighth, Jane Park rolled home an eight-footer for birdie to go 2-up, a margin that lasted one hole as Creamer birdied the ninth to cut the deficit to 1-down.
Jane Park sank a three-footer for birdie at the 13th to reclaim her 2-up edge. The duo halved the remaining holes to give Jane Park, 16, a spot in Sunday's 36-hole final.
'She got an early start this morning, but there was a lot of golf to be played,' said Jane Park. 'So I just kept going, didn't think negatively, made a couple of birdies and now I'm here.'