Thailand defeated Guam to claim a consolation win at the Fed Cup Asia/Oceania Group 2 in Wellington, New Zealand, on Friday.
The Kingdom's stars won the tie 3-0 to finish second in Pool B with two wins and one loss at Renouf Tennis Centre.
The Philippines won the pool after claiming their third successive victory, beating winless Turkmenistan 3-0 yesterday.
They will play off against Pool A champions New Zealand today, with the winners advancing to Group 1.
Thailand, meanwhile, will face Pool A runners-up Pakistan in a play-off for third place on the same day.
Thailand suffered a disappointing defeat against the Philippines on Thursday, which ended their hopes of gaining a promotion to Group 1.
Rising star Anchisa Chanta, 17, was rested on Friday after playing against Turkmenistan and the Philippines and winning both of her singles matches.
Tamachan Momkoonthod was selected for the opening singles match against Guam yesterday and the 22-year-old from Ubon Ratchathani proved too strong for Katrina Lai, winning their match-up 6-0, 6-0.
Watsachol Sawatdee, 19, defeated Nadine Del Carmen 6-2, 6-3 before veteran star Tamarine Tanasugarn and Tamachan completed the sweep with a 6-0, 6-1 win over Del Carmen and Charlayne Espinosa.
"The match against Guam was not very difficult. Our players played their best and got the win," said Tamachan.
"The third-place match against Pakistan will not be easy work but we will try to get the third place."