Nam, world No 522, defeated Lu Tyler of the US, world No 994, 6-4, 6-2 after one hour and 21 minutes in the men’s singles second round.
Nam, No 2 seed, will face No 8 seed Arjun Kadhe of India, world No 758, in the next round.
In other matches, Andrew Harris of Australia crushed Yuichi Ito of Japan 7-6(2), 6-2. Arjun Kadhe of India beat Arata Onozawa of Japan 7-5, 6-2. While Lawrence Bataljin of Australia lost to Dusty H Boyer of the US 1-6, 2-6.
In the men’s doubles semi-final, the duo of Tyler of the US and Kelsey Stevenson of Canada beat Yurii Dzhavakian of Ukraine and Indian Kadhe 7-6(2), 6-2. While the Japanese pair Shunrou Takeshima and Issei Okamura bested S D Prajwal Dev of India and Keisuke Numajiri of Japan 6-2, 6-2.