The No 13seed won 7-6, 6-3 over No 6 Kasidit Samrej of the hosts in the boys’ singles.
He was scheduled to face No 1 Akanit Pumjit, also from Thailand, in the gold medal match on June 17.
Pumjitearlier defeated his compatriot Yuttana Charoenphon 6-3, 6-4.
Thegirls’ final will see a match between No 1 Salsa Aher of India and NatashaSengphrachanh from Canada.-VNA