Nur Hamizah of ITE and Neo Hoon Suan of NTU finished second and third with timings of 2:36.73 and 2:38.70 respectively.
Jianyong's timing of 4:14.38 broke his previous personal best of 4:15.80 by more than a second.
Reyhan finished in a time of 51.36 seconds, just 0.08s shy of his personal best of 51.28s.
Jianyong took the lead right from the gun and never looked back as he won comfortably.
Nabin Parajuli clocked 10:18.20 to finish first while Wilbert Ho of NUS was second in 10:35.