PORT Adelaide has served up the first boilover of the season, downing flag fancies Melbourne by 26 points at the MCG.

Justin Westhoff kicked five goals and Tom Rockliff tallied 44 possessions in the 12.15 (87) to 9.7 (61) win that marks the Power as a team to watch in 2019.

POWER'S BIG SCALP Full match coverage and stats

With four debutants and another two playing their first game for the club, there was plenty to like about Ken Hinkley's side on Saturday afternoon.

After they conceded the first three goals of the game, the Power gradually worked their way into the contest before taking control in the second half.

Jack Watts put behind an undisciplined opening to play an influential hand and Westhoff was a superb spearhead.

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Scott Lycett outworked Max Gawn while Melbourne talls Tom McDonald and Sam Weideman had no impact.

Rockliff, Travis Boak and Sam Powell-Pepper were relentless at the contest but the Power changed the game on the outside.

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On a humid day in Melbourne, the Demons couldn't go with Port's runners as the visitors finished with 93 more uncontested possessions.

The final margin was a fair one but for much of the afternoon, the teams remained within a couple of goals of each other.

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First-gamer Zak Butters gave the Power their first lead in the second quarter with back-to-back majors.

Jake Melksham and Christian Salem were terrific for the Dees as they won the lead back in the third term but Simon Goodwin's team couldn't make it stick.

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With the match in the balance in the final term, Nathan Jones dropped a sitter on the 50-metre line before Watts denied the hosts a major with a last-gasp mark.

Twenty seconds later the ball was in Westhoff's hands in the goal square for a momentum-halting goal that allowed Port to run away with the win.

MEDICAL ROOM
Melbourne: Jordan Lewis was a late withdrawal with a hamstring issue, but the Demons emerged from the match unscathed.
Port Adelaide: Todd Marshall appeared to suffer a concussion following a head clash with Bayley Fritsch in the last quarter.

NEXT UP
The Demons head down the highway to take on Geelong in a blockbuster Saturday night clash at GMHBA Stadium, while the Power return home to host Carlton on Saturday afternoon. 

MELBOURNE               4.3      6.5      9.7       9.7 (61)                  
PORT ADELAIDE        2.4       6.8     10.9     12.15 (87)          

GOALS
Melbourne: Melksham 2, T.McDonald, Brayshaw, Fritsch, Sparrow, Weideman, Petracca, Jones
Port Adelaide: Westhoff 5, Butters 2, Marshall, Duursma, Ebert, Gray, Boak

BEST 
Melbourne: Salem, Harmes, Melksham, Hibberd, Brayshaw, Oliver
Port Adelaide: Westhoff, Rockliff, Gray, Boak, Burton, Ebert

INJURIES 
Melbourne: Lewis (hamstring) replaced in selected side by Sparrow
Port Adelaide: Marshall (concussion)

Reports: Nil

Umpires: Rosebury, Stephens, Hosking

Official crowd: 38,866 at the MCG