
After taking an unassailable 3-0 lead on Saturday, Thailand got the fourth point through Wishaya Trongcharoenchaikul who vanquished Patrick-John Tierro 6-4 6-1.
Then Jirat Navasirisomboon beat Alberto Lim 6-4 6-2 to drive the final nail in the Philippines coffin. Jirat has won all three rubbers since he made his Davis Cup debut in February against Kuwait.
Thailand will play the final in Pakistan in September for promotion to Group I in 2018.