Perth enjoyed the better chances in the opening half, but couldn't find a way past goalkeeper Mark Paston.
Paston produced a sharp save to deny Billy Mehmet's powerful strike in the 14th minute, while the custodian produced an excellent reflex save in the 22nd minute when his left boot kept out Travis Dodd's header.
The Phoenix's best chance of the half fell to Louis Fenton, whose mistimed close-range strike was easily saved by Danny Vukovic.
Glory defender Josh Risdon went close to breaking the deadlock in the 53rd minute when his 25-metre thunderbolt rebounded off the upright.
But Smeltz found the back of the net in fine style when the Kiwi international easily wrong-footed Andrew Durante before sending a pin-point strike to the right of Paston.
However, celebrations soon turned to misery for the 7982 crowd when Brockie, who scored two goals in last week's 3-0 triumph over Newcastle, dinked a ball over Pantelidis before beating Vukovic in a one-on-one situation.
The clash was the first meeting between the two sides since Perth's 3-2 extra-time triumph in last season's minor semi-final.
-AAP