Even though it was his 13th goal for the Wellington Phoenix, Chris Greenacre's 34th minute header was the first time he had scored the winner for the New Zealand club.

The Englishman dived to finish a wonderful cross from youngster Marco Rojas to guide the Phoenix to a 1-0 win over Adelaide United on Saturday night, basically clinching the sixth, and last, finals spot.

Greenacre acknowledged it is always good to score but said hitting the winner makes it so much more enjoyable.

"It's always nice to score, and I know every goal is important but there is nothing better for a striker than to get the winner," Greenacre said.

"It was a great cross from Marco (Rojas). As soon as he got the ball I was desperate to get into the box because his crosses are quality and this one was inch perfect."

Greenacre continued his praise of Rojas and also said the scoreline could have been a lot different if it wasn't for the performance of Adelaide keeper Eugene Galekovic.

"Marco has been outstanding since he came into the side. He has won us games with his crosses and scored a couple himself," he added.

"It was a fantastic performance by our lads. We created some good chances and the fact we only scored one was down to the brilliance of Eugene Galekovic.

"He is rated the best keeper in the league and he showed it. One save in particular, from Nicky Ward, was amazing."