In his first year as a senior athlete, Balchin (20) won the 800m, 1500m, 3000m and 5000m titles.
"I'm happy with that," he said. "They have all been tough races."
He added the 5000m at the Caledonian Ground on Saturday with a personal-best time of 14min 47.36sec from Dougal Thorburn (Ariki), 14min 51.87sec, and Callan Moody (Ariki), 14min 54.69sec.
It was 9sec faster than he had run before, which was remarkable in a strong southerly wind blasting the back straight. Moody also ran a personal best by four seconds.
There were still six runners in the front bunch when six laps were completed in 7min 9sec.
They were lapping between 72sec and 74sec at this stage. Two runners were dropped on the seventh lap and Tony Payne (Caversham) fell off the pace in the ninth lap.
"I just tried to stick with the leading bunch," Balchin said. "We took turns taking laps into the strong back straight wind."
The pace had slowed to 75sec on the 10th lap when Thorburn gingered up the pace and ran 70sec. He was still leading at the bell and maintained that lead until passed by Balchin with 260m to go. He had been developing his speed at the end of races and it showed in the last 400m, which he ran in 60sec.
Shauna Pali (Hill City), the head girl at Kavanagh College, won the women's race in 17min 54.34sec.
It was a personal-best time by 25sec and she was 2min ahead of Megan Balchin (Leith).
The big upset of the day came when Timaru schoolteacher Kellie Palmer (Canterbury University) beat Rebekah Greene (Hill City) in the women's 1500m.
The wily Palmer (27) applied pressure down the back straight and opened up a 5m gap on Greene.
The Hill City runner closed the gap around the top bend but was still 2m behind coming into the straight, and it remained that way to the tape.
Palmer won in 4min 29.27sec from Greene, 4min 30.36sec.
"It was the first time I'd raced Rebekah and I was a little bit scared of her," she said.
"She had run a fast 800m so I knew I'd better speed it up in the last lap."
The New Zealand championships are just two weeks away and Greene restored her confidence by running a fast 400m in 62.35sec later in the meeting.
Former Otago runner Tony McManus (Canterbury) took the opportunity to get out of Christchurch and won the masters men's 1500m in 4min 35.55sec.
Matthew Robinson (Southland) won the men's sprint double with a 100m in 11.03sec and a 200m in 22.40sec.
Dean Rusbatch (Taieri) lifted his national age 16 shot put ranking from 12th to seventh when he threw 14.84m. It was a personal best by 1.33m.
Bryn Jones (Hill City) improved his distance by 74cm in winning the age 16 javelin with 49.72m.
