More than 5000 soccer fans were treated to a tough and close clash at Campbelltown Sports Stadium on Saturday.
A second-half penalty conversion by Adam le Fondre proved the difference as Sydney FC secured a 1-0 win over Wellington Phoenix.
The result means Sydney FC has jumped into second place on the Hyundai A-League ladder.
Both teams were guilty of not capitalising on scoring chances in the first half.
The score remained lock at nil-all at the half-time break.
The match's turning point came in the 65th minute when Sydney FC captain Alex Brosque was knocked to the ground by Phoenix goalkeeper Filip Kurto when competing for the ball.
Referee Shaun Evans awarded Sydney FC a penalty and le Fondre stepped up to drill home the goal.
Sydney FC and the Phoenix missed opportunity to score in the final half hour, but the Sky Blues held on for a 1-0 win.
Sydney FC coach Steve Corica told reporters at a press conference that it was a "very important" win.
"I thought we were excellent in the first half, we had three or four very good chances," he said.
"We dominated in the second half when we had to, but I thought they were very good too and put us under pressure."
Corica said Sydney FC was happy to secure victory at Campbelltown Sports Stadium.
"The pitch was good, though it was quite spongey," he said.
"We were pleased playing here - it was like a home game to us."
Phoenix coach Mark Rudan said his team didn't show enough quality when in attack.
"It was quite frustrating if you look at how the game panned out," he said.
"But it was good defending by them [Sydney FC], they threw their bodies on the line quite often.
"It wasn't through lack of trying, our boys are staying disciplined and believing in themselves.
"When it's a tight game, it takes a little bit of quality to break the deadlock - that proved to be the case [on Saturday]."