Brisbane have started their A-League title defence with their worst losing streak in three seasons after being sunk by two Sydney FC wonder goals at Suncorp Stadium.

The Sky Blues punished a sloppy Brisbane with a deserved 2-0 upset on Friday night, highlighted by a Marc Janko super-strike for one of the best goals in the competition’s 10-season history.

Austrian captain Janko left the 14,141-strong crowd dumbstruck in the 28th minute by pouncing on a poor clearance by Roar goalkeeper Jamie Young, chesting the ball high before thumping the 35m volley into the left-side netting to embarrass Young.

Watch it below:

Not to be outdone, Serbian midfielder Milos Dimitrijevic produced a long-range screamer of his own in the second half to ensure Sydney took all three points home and jump to the top of the table.

Backing up from their extra-time FFA Cup quarter-final on Tuesday, it was the Sky Blues who looked to have more energy and punch than the home side.

The Roar appeared rattled by a pre-game mishap to Johnny Warren Medallist Thomas Broich who sustained a painful blow behind his left thigh in the warm-up.

Broich copped a stray knee from Albanian striker Mensur Kurtisi in a close-quarters drill and spent several minutes receiving treatment before gaining the green light to play.

The gutsy German, who played every minute of every match in the Roar’s title charge last season, was well off his best and limped through the second half as his side failed to penetrate Sydney’s defence.

In what was an uncharacteristic performance, Brisbane often resorted to long balls rather than keeping faith in their slick passing game.

Turnovers and poor clearances were more the order of the day and the champions could easily have conceded more goals from their mistakes.

Not since their second title win in 2011-12 – when Brisbane suffered a five-loss mid-season slump – have they lost three games in a row.

While Sydney’s win was thoroughly deserved, the Roar were fuming after referee Peter Green didn’t award a penalty in the 52nd minute when Alex Brosque appeared to handball inside the box.

Two minutes later, an unsuspecting Green blocked a Roar clearance and allowed play to go on for a Brosque-Dimitrijevic 1-2 which ended with the Serb curling his beautiful 25m shot over an out-of-position Young.

The last-placed Roar join the defunct North Queensland Fury (2009-10) as the only team to start a season with three straight losses.

AAP