Radford was ecstatic that the 5km race went exactly to plan.
"It played out exactly how I wanted it to,'' he said. "I sat at the back of the pack for the first lap and then Yasu took off on that second lap. I maneuvered my way through the pack to get on to his feet. And then I just really waited until the last 300m where me and Yasu had a really tight finish and I just happened to come out and time my finish correctly,'' said Radford.
The New Zealand Championship silver medal went to Michael Mincham in a time of 58:34.38 in a close finish with bronze medal winner Phillip Ryan.
The minor placings in the Oceania Championship were awarded to Australian Ridge Grimsey in second and Phillip Ryan in third.
In the women's field, Downing made it two from two with a decisive victory, comfortably winning by 10 seconds. With Downing ineligible to win the Oceania Championship, the title was taken by Cutting who finished four seconds ahead of Charlotte Webby.
The New Zealand Championship race was won by 19-year-old national representative Emma Robinson in a time of 1:04:44. Yesterday's 10km winner Grace Somerville won silver and Webby claimed the bronze.