Errol Gulden continued his All-Australian calibre season on Saturday night with a best-on-ground Sydney Derby outing, and his coach John Longmire says the left footer's form is no fluke.

Gulden racked up 32 disposals in the wet conditions at Giants Stadium and kicked two stunning goals to win his first Brett Kirk Medal and be the driver of Sydney's 11-point win.

The 21-year-old is in his third season and is averaging 26 disposals to go with 18 goals.

When asked about Gulden's impact, Longmire could only smile.

"He's not a bad young fella, Errol, he goes alright," Longmire said with a slight chuckle.

"He's just got a great mix, always has. He works really hard at his game.

"He watches opposition vision, he's all over stuff, he contributes in meetings, always has, he trains as hard as any player and he runs hard and works hard on game day.

"They're the things he does, and he's got a bit of talent as well, but he doesn't rely upon that. He works super hard."

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Gulden's first goal was a miraculous 40m checkside on the run from the left boundary line, while his second came during the tense fourth quarter via a 48m snap off two steps.

He also had a game-high 677m gained and an equal game-high eight score involvements.

Gulden was just one man to impress for the victors, who kicked 11 goals from 23 inside 50s without a miss in the first half on the way to victory.

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Hayden McLean kicked four goals in the first game following Lance Franklin's retirement, while veterans Jake Lloyd, Luke Parker and Callum Mills were also influential.

Longmire was delighted with the performance to snap GWS's seven-game winning streak.

"We were efficient in front of the ball, which really helped in the first half," he said.

"Some of those stats you don't see every day of the week, but you take them when it comes.

"The first half we tried to not let them get settled too much because once they get settled, they're very hard to break through.

"So we just tried to disorganise them a little bit."

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