Nam, No 3 seed, beat Lukas Ollert of Germany 7-6 (7-3), 6-1 after one hour and 23 minutes in the first round.
Nam is world No 423, the highest in his career. Ollert is world No 717.
Nam met difficulties in the first set, but he proved his power in the next period to beat his German rival.
Meanwhile, No 1 seed and defending champion of Vietnam F4 Futures, Roman Safiullin of Russia, also needed more than one hour to beat Paul C. Oosterbaan of the US 6-3, 7-5 in the first round.
On October 21, Nam won the men’s doubles title at the Vietnam F4 Futures. However, he missed the men’s singles title following a loss to Safiullin of Russia in the final.