Former Western Sydney striker Joey Gibbs hit a double as the Demons stunned the Mariners, after taking a 2-0 lead.

Kwabena Appiah-Kubi dragged the Mariners level with a brace, but Gibbs was the hero with the winner.

Sydney FC cruised past Darwin Rovers 8-0, while Gold Coast City accounted for Western Knights 3-1.

Moreton Bay United and Broadmeadow Magic's clash finished 2-2 after 90 minutes and went to extra-time.

PIC SPECIAL: FFA Cup last 16 matchday three pics

Blacktown City v Central Coast Mariners

Paul Okon's side were bundled out by NPL opposition in the Round of 32 for the second season, despite Appiah-Kubi's brilliant double.

Gibbs was the hero after netting on two minutes, with Giorgio Speranza doubling their advantage on 17 minutes.

The 25-year-old ex-A-League player netted the winner on 82 minutes.

Darwin Rovers 0 Sydney FC 8

The Sky Blues eased past the Northern Territory's sole participant with Bobo netting four goals. After a goalless opening 20 minutes, the Brazilian struck twice, before David Carney made it 3-0 before the break.

Stand-in skipper Matt Simon, Jordy Buijs and Milos Ninkovic added further goals in the second 45, before Bobo added two more to seal a comprehensive triumph.

PIC SPECIAL: FFA Cup last 16 matchday three pics