However, the Tauranga team started to come back into the game, helped by the sinbinning of Western Heights' Buckley after a dangerous tackle.
And nifty Te Ruki Waikaho seized his chance in the 75th minute, breaking free of several last ditch tackles to sprint over the line taking the score to 15-7 after the conversion.
But any hopes of a dramatic come back were dashed three minutes later when Western Heights second-five Damel Taui pounced on a loose Te Wharekura o Mauao pass right their goalline.
Te Wharekura o Mauao coach Heywood Kuka was not too disappointed with the result and was particularly impressed with the performance of 15-year-old Te Aparua Tata who played at centre.
"I think it was a fair result today. Western Heights had the lion's share of the possession and we made too many mistakes," Kuka said. "I was delighted to see Te Apa get on so well. Bringing talented youngsters through is what it's all about.
"We will go back to the drawing board now and I think it will be about getting the boys to believe in themselves more."