Fittler made seven changes after the first-up loss in Brisbane, including the axing of star Latrell Mitchell.
Tom Trbojevic scored a hat-trick on his return from injury.
Fittler says the players he called in did the job.
He says they did themselves really proud.
The decider is next month in Sydney.
RUGBY LEAGUE COVERAGE POWERED BY MACHINERY HOUSE - IN A LEAGUE OF THEIR OWN