Westhoff had 24 possessions, 14 marks and 5 goals on a night where a slow-starting Port Adelaide side demolished the visitors by 56 points.
The bearded utility was involved all over the ground and effective in providing rebound from defence as well as a forward option throughout the night.
Port players dominated the votes allocated by coaches from both sides with Chad Wingard (6 votes), Travis Boak and Kane Cornes (4), Brad Ebert (2) and Jasper Pittard (1) also among the vote-getters.
Giants captain Callan Ward was the only GWS player to be named in the voting.
Vote for you best in the Supporters' Player of the Year Award here.
Port Adelaide v GWS - AFLCA Round 2 votes
10 Justin Westhoff (PA)
6 Chad Wingard (PA)
4 Travis Boak (PA)
4 Kane Cornes (PA)
3 Callan Ward (GWS)
2 Brad Ebert (PA)
1 Jasper Pittard (PA)
AFLCA votes - Port Adelaide leaderboard
10. Justin Westhoff
9. Hamish Hartlett
8. Travis Boak
6. Kane Cornes, 6. Chad Wingard
5. Brad Ebert, Jay Schulz, Jackson Trengove
2. Paul Stewart
1. Jasper Pittard
