Broich and La Rocca share Marston medal
The Roar came out on top after extra-time with Henrique scoring the winning goal on 108 minutes to secure a 2-1 come from behind win.
It is the first time the Joe Marston medal has ever been awarded to more than one player in A-League and National Soccer League history.
Broich was as influental as always for the Roar in the centre of the park and it was his free-kick that saw Besart Berisha head home to equalise in the dying stages of regular time.
"It's a great feeling," Broich said in his acceptance speech. "That's three wins in four years... you guys are awesome.
"But I really feel for Western Sydney Wanderers. They've had two fantastic seasons and to lose in extra-time that must be heartbreaking. They are good opponents."
La Rocca was almost unstoppable in the midfield for the Wanderers and becomes only the third player in A-League history to win the medal on a losing side.
"Congratulations to Brisbane Roar," said La Rocca. "They win the final they deserve.
"Thank you to all the supporters that came over from Sydney. Thank you to all the supporters from Brisbane, the atmosphere was fantastic tonight.
"We will try to win it next season."