The victory at Moreton Daily Stadium not only lifted the Roar to third on the ladder, it has cleared up the finals picture heading into the last round of home-and-away fixtures.
Defeat ended the finals hopes of the Glory as well as any chance Western Sydney had of avoiding a fourth-straight season without playoffs.
If Adelaide United get a point against the Wanderers at Coopers Stadium on Thursday they will also secure their finals spot, putting seventh-placed Wellington out of the hunt ahead of their match with Macarthur on Friday.
A win for the Wanderers however will give the Phoenix the opportunity to sneak into the six at Adelaide's expense if they can beat the Bulls.
Wednesday's result also secured Macarthur's finals spot in their maiden campaign, the expansion club now a chance of finishing as high as third if results go their way.
It is the Roar however who have the box seat in the race for third, with a win over second-placed Sydney on Saturday in Redcliffe all they need to secure the spot and a home final in the opening weekend of the post-season.
Should the Roar slip up against the Sky Blues however, the Mariners will have a chance of their own to claim third when they host Western United in Gosford on Saturday.
Regardless of where his team finish on the ladder, Roar coach Warren Moon was ecstatic to have the team's finals position locked in with one game to play.
"I'm very proud, very proud of what the club's achieved," he said.
"Not just myself, because I'm just one cog in the chain, it's all of us.
"We weren't given much of a chance of making finals let's be honest.
"Internally we believed and I believed in the squad we had, the talent we had coming through and what they could do, but it's one thing believing, it's another thing going to do it."
THE A-LEAGUE FINALS PICTURE
1. Melbourne City - 48pts (Premiers, have matches against Melbourne Victory (Sunday) and Newcastle (TBA) remaining)
2. Sydney FC - 44pts (2nd place secured, play Brisbane away on Saturday)
3. Brisbane - 40pts (Will finish 3rd with win over Sydney on Saturday, could finish as low as sixth depending on results)
4. Central Coast - 39pts (Finals secured. Play Western United on Saturday. Win seals at least 4th spot, possibly 3rd. Defeat or draw could drop them to sixth)
5. Macarthur FC - 39pts (Finals secured. Could finish as high as third with win over Wellington on Friday, could drop to sixth with defeat or draw.)
6. Adelaide United - 38pts (Win or draw against Western Sydney on Thursday secures finals. Loss leaves them in danger of being overtaken by Wellington).
7. Wellington Phoenix - 35pts (Need to beat Macarthur on Friday and hope Adelaide lose to Western Sydney on Thursday to make top six)
