South Coast only had themselves to blame for Sunday's 3-0 loss to Blacktown Spartans at WIN Stadium.

Errors were at the root of all three Spartans' goals and halted the Wolves' mid-season surge in the NSW National Premier League.

The Spartans scored twice from the penalty spot via Shu Sasaki and gifted a third to Josh Tanner just before full time.

To make matters worse for the Wolves, Peter Simonoksi missed a penalty when trailing 2-0 just minutes before half time.

Wolves coach Jacob Timpano admitted the errors were costly.

"The first one was a clumsy challenge and the second one, sometimes they are given, sometimes they are not. Then we go down the other end we miss a penalty which could have changed the game," Timpano said.

"Towards the end we threw numbers forward and played the last 20 minutes with two guys at the back. We threw everything at them. Credit to Spartans, they held out.

"Sometimes in football a few decisions go against you, then you miss a penalty.

"It probably wasn't our day but I was pleased with the boys second half and the way they kept going."

Despite having the better of chances over the first quarter of an hour, the Wolves fell behind in the 26th minute.

Zac MacKenzie brought down Sasaki in the 18-yard box, who dusted himself off and converted. He'd have a second just five minutes later when Madden was adjudged to handball in the box.

Simonoski had his chance to peg one back just before half time after being brought down himself, but the usually reliable striker pushed his effort wide of the mark.

The Spartans were reduced to 10-men with 20 minutes remaining when Luka Dukic was dismissed. But the visitors would stand strong following the dismissal and get a third on the counter attacker after Darcy Madden coughed up possession in front of goal.

"In three weeks of football, the first half was the most disappointed we have had. That is going to happen from time to time.

"I just think we just lacked that bit of intensity which was key to us in the last couple of weeks. Credit to our boys, in the second half they responded but things didn't go our way."

The Wolves now have a week off where they will celebrate the club's 35-year history with a reunion before returning to the pitch against Parramatta.