Teammate Luke Ryan took out the best-on-ground honour for his work in defence, earning eight votes as the Dockers held the Swans to their lowest score since 1971.
After winning 22 disposals and kicking a goal in front of fans at Optus Stadium, Mundy continued to make his case for a contract extension.
Last week, Mundy spoke of his desire to play on for an 18th season in 2021.
Now coach Justin Longmuir has weighed in on the discussion, insisting the club would look to extend the veteran's career by another year.
“We'll keep the dialogue open,” Longmuir said in his post-match press conference.
“Me and (football boss) Peter Bell have had a chat to him. At the moment, we're all keen to push ahead with that.
“We've left it to the end of the year on purpose, because of his age and where he sits. But we're just really happy with his form and really rapt with what he's teaching our younger players.
“He's a calm head during the week and on game day, so he's a real benefit for us at the moment.”
● Fellow Seymour product Tom Cole has enjoyed an outstanding eight-game winning streak with West Coast.
In the club's round 13 match against GWS on Sunday, the Eagles comfortably held a 31-point lead at three-quarter time.
But the final stanza had the top-four team working overtime as the fast-finishing Giants kicked four out of the last five goals before falling 12 points short.
Cole had a more modest output than usual, picking up eight disposals and three intercept possessions.
