Bad luck costs Singaporean
Ng continued his good pace with 214 and 238 and was within striking distance of another leader and athlete from Kuwait, Mohammad Al-Zaidan taking over the running followed by 2009 AMF World Cup champion, Choi Kong-Kyu in second at the halfway mark.
The 22-year-old Singaporean kept a fast pace with 256 in the fourth hauling him up to third behind yet another new leader, Eric Tseng of Hong Kong as the Korean, Choi remained in second.
Choi settled for second with 1370 which might not be good enough for a medal while another athlete from Kuwait, Jassem Darwish stromed home to take up third with 1366. Ng totaled 1323.
Jason Yeong-Nathan in his second Asian Games, finished 16th position with 1280 ahead of first-timer, Basil Low in 19th position with 1269. Mark Wong ended in a dismal 41st position managing only 1155.
Singapore's hope now lies with Remy Ong and Benjamin Lim, who are drawn in the second squad which will start at 2.30pm local time.
Detailed scores: Men's Singles Squad A/