Petermann (17) compiled 10 points, nine rebounds, three assists, two blocks and two steals as Otago Boys' beat defending champion Westlake Boys' High School 74-69 in the final in Palmerston North on Saturday.
Petermann (17), who usually plays guard, said his final game for the school could not have gone any better.
''It was crazy stuff. I can't believe that was the last one. It doesn't really feel real, I guess.
''Everyone in the team had a good run. I think the reason we won is because it was a team game.
"At the end of the day, I don't think there was another team out there that played with the heart and brotherhood that we did,'' he said.
As well as an impressive haul in the final, the 1.85m guard finished with 15 points, six rebounds, one block, one assist and a steal in the semifinal win against Rangitoto College.
Petermann, who was the first player to score 100 points in the Dunedin men's A grade in the past season, has completed his SAT test and is putting a highlights video together in a bid to attract an American college offer.
''I want to go to college and I'm doing all I can to do that. Whatever it takes for me to do that, I will do it.''
Born in Germany, Petermann moved to Costa Rica with his mother, Rosemarie, when he was 7.
After a year there, they shifted to New Zealand, and have spent the past eight years in Dunedin.
While he loves football and is a keen cross-country runner, Petermann fell in love with basketball in year 9 at Otago Boys'.
''It really started taking off when Mark Dickel came down. And then I just started working out every morning.
''A bunch of us just loved it. We started playing for fun. Sometimes we were training twice a day just for something to do.
"If one of us wasn't doing it and the others were, you would feel out of place,'' he said.
Petermann, a classy guard with a deadly jump shot and smooth handles, represented Otago under-15, under-17 and under-19, and hopes to make basketball a big part of his future.
''I just want to take basketball as far as I can. Basketball is what I want to do with my life. If I can do that, I will be happy.''
- Robert van Royen
