United had a three-goal lead against Subiaco at half-time at Percy Doyle Reserve on Friday, but gave away two goals in a tight finish to the 4-3 win.
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Joondalup coach Nick Jennings conceded his team was lucky to get away with the three points after a poor second half.
“We didn’t see out the game, we completely switched off,” he told nplwa.com.au.
At Alfred Skeet Reserve on Saturday, the Gulls thrashed Armadale 5-1, with braces to Jack Salter and Billy Quinncroft.
In Joondalup, the Jacks produced a fantastic second half fightback to beat Inglewood United 3-2 in an entertaining battle at ECU Football Stadium on Saturday.
Scottish striker Daryl Nicol was the star, bagging a brace and setting up the other.
Nicol said it was a gutsy win, but not the best of starts.
“It was a disappointing start by us again. I don’t know why this is but we need to sort it out,” he said.
“But that sort of win can kick-start our season.
“We’ve had a slow start and you can struggle with confidence, so to come from two goals down against a top team is great and we hope to kick on from here.”
Coach Dale McCulloch thought his side deserved the win despite the poor start that had them fall 2-0 behind inside the first 20 minutes.
He said the side’s fitness showed in the second half when they overran the visitors.