Rowe barely broke into a sweat in the cool, perfect 23C conditions at the Hawke's Bay Regional Sports Park to finish almost 15m ahead of fellow travelling Australian stablemate Andre Waring.
The 24-year-old from Melbourne clocked 1:48.06 with Waring, 23, of Thomastown in Victoria, crossing the line in 1:52.03.
Samuel Bremer, of Hill City University Athletics Club in Dunedin, came in third at 1:52.08.
Equal 800m senior men's Australian record holder, Rowe, had Quin Hartley, of Palmerston North, pacing him in the Allan Potts Classic men's equivalent but his time today is an incremental build up in the season towards his PB of 1:44.40, which he set in July 2014.
The St Kevin's Amateur Athletic Club member missed out on making the Australia athletics team to the Rio Olympics by 0.27s last year.