Lowly Port Adelaide upset reigning AFL premiers Sydney by 30 points in Saturday’s trial match in Adelaide.

The Power stormed home in the last quarter with four goals to Sydney’s one and won 15.12 (102) to 10.12 (72) before 5103 spectators at AAMI Stadium.

Port, who last week downed West Coast, were inspired by captain Travis Boak, who kicked three goals in a best-afield display.

His teammates Kane Mitchell and Aaron Young each kicked two majors while onballer Brad Ebert and Justin Westhoff were influential.

Sydney stalwart Adam Goodes and Luke Parker both potted two goals while Josh Kennedy and Mark McVeigh were standouts in the midfield.

The Power, who haven’t made the finals since 2007, lost John Butcher to a suspected hand injury as the key forward made his first AFL appearance this year after hip surgery.

Port controlled the early stages with Boak kicking two goals and gathering 14 disposals to halftime and his teammates Hamish Hartlett and Brad Ebert prominent.

Port led 7.5 to 4.7 at the main break as Sydney lacked spark and managed just one goal in the second term.

The Swans clicked into gear in the third quarter, reducing the margin to one point by booting three quick goals.

Port midfielder Mitchell then pushed his claims to be elevated from the rookie list in time for the premiership season with two goals in 60 seconds, and Daniel Stewart kicked another, to restore the Power’s advantage.

Two late goals to Sydney, by Ben McGlynn and Parker, reduced their deficit to seven points at three-quarter time but Port sealed their victory with the initial three goals of the last term.