THERE’S no doubt Sydney FC have been dominant this season but against Adelaide they broke an incredible record.

The Sky Blues’ 4-0 rout of the Reds, their 12th game without a loss in the opening 12 rounds, saw Graham Arnold’s side set the longest undefeated streak to start an A-League season.

Two goals from Alex Brosque and one each from Filip Holosko and Rhyan Grant helped Sydney bring up their ninth win of the season to go with their three draws.

“Sydney were superb,” said former Sydney FC player Mark Rudan.

“They were efficient and they just demolished Adelaide.

“The question is going to continue to be asked; how long can they continue to go with losing a game?

“That ‘X’ on their back just gets bigger and bigger.”

‘UNBELIEVABLE’: ‘Transformation’ that’s made Sydney

Filip Holosko of Sydney celebrates after scoring. Source: Getty Images

While Sydney’s undefeated record won’t go on forever, it seems unlikely anyone will match their undefeated record anytime soon.

But that’s not the only mark that was beaten in the round 12 clash.

RECORDS BROKEN IN SYDNEY V ADELAIDE

- Sydney achieved the longest undefeated run to start an A-League season

- Sydney have conceded the least goals (5) after 12 A-League matches to start a season

- Sydney’s first win in South Australia in 1772 days

- Alex Brosque becomes the second player to score 50 goals for one A-League club (Archie Thompson 90 for Melbourne Victory)

- The second time Sydney have scored in nine consecutive away matches

#SydneyFC notch up their 1st win in SA in 1,772 days and now have the longest undefeated streak to start an @ALeague season #ADLvSYD pic.twitter.com/tJkMHQYtfp — Fox Sports Lab (@FoxSportsLab) December 26, 2016