He did not make a good start and lost the first set 3-6. But he bounced back to win the second 6-3, and send the match into a decider.
He led 5-3 and held a total of six match points but could not finish off his opponent, who equalized at 5-5 and went on to win 7-5 in two hours and 35 minutes.
This is Nam’s second defeat in a final this year after last month’s M25 Toulouse-Balma in France.
He won prize money of $1,272 and added eight points to his ATP world ranking.
He is set to play another M15 tournament in Thailand before returning home to prepare for the SEA Games 31 in May.
Recently he entered the top world’s 500 for the first time since October 2019. His highest ranking so far has been 385th in November 2018.