The Yellow Wall roared, and Borussia Dortmund answered. On a warm Saturday afternoon at Signal Iduna Park, the hosts dispatched Hamburg SV 2-0 with an efficiency that belied the early stage of the season, a result that carried them into the upper reaches of the Bundesliga while leaving their visitors staring at the drop before September had even arrived.

It was a performance built on early aggression and clinical finishing. Serhou Guirassy struck inside the opening ten minutes, and a first-half own goal from Sebastiaan Bornauw effectively settled the contest before the interval. Even a second-half red card for Samuele Inácio could not knock Dortmund off their stride, the home side seeing out the closing act with the calm of a team that had long since done the hard work.

For Hamburg SV, promoted with such optimism and expectation, this was a chastening afternoon. Two matches into the campaign, they remain without a point and without a goal, their name sitting uncomfortably close to the bottom of the standings. The margin here felt generous to the visitors rather than harsh.

Guirassy strikes early

Dortmund needed only nine minutes to impose themselves. Konstantinos Karetsas, sharp and inventive, threaded the pass that mattered, and Guirassy did the rest. From the centre of the box the striker opened his body and swept a right-footed shot into the bottom left corner, the kind of clean, decisive finish that separates the elite forward from the merely willing.

The goal set the tempo for everything that followed. Emboldened, the hosts pressed high and squeezed the space, forcing Hamburg SV back towards their own penalty area and asking questions the visitors were ill-equipped to answer. The crowd, sensing blood, urged their side forward in waves of black and yellow.

Guirassy's early intervention was more than a goal; it was a statement of intent. It confirmed Dortmund as a side eager to settle matters quickly rather than let them simmer, and it exposed a Hamburg SV defence still learning the punishing rhythms of the top flight.

A cruel own goal

If the first goal was earned, the second carried a streak of misfortune for the visitors. Deep into first-half stoppage time, with the interval beckoning and Hamburg SV desperate to reach the sanctuary of the dressing room only one goal down, disaster struck. Bornauw, caught in the maelstrom of Dortmund pressure, turned the ball into his own net to make it 2-0.

The timing was merciless. A goal on the stroke of half-time drains the spirit like few others, arriving just as a team steels itself to regroup. Hamburg SV trudged off with the scoreboard reading double their deficit and their afternoon already slipping beyond reach.

For Dortmund it was the perfect punctuation to a dominant opening period. Two goals to the good and firmly in control, they had constructed a lead that never once looked in danger of being surrendered, and the second half became an exercise in management rather than pursuit.

Down to ten

The one blemish on Dortmund's copybook came on 77 minutes, when Inácio was shown a red card and reduced the hosts to ten men. In another context it might have invited a nervous finale, a late siege from a team hunting a way back into the game.

But this was not that kind of afternoon. Hamburg SV, toothless and out of ideas, lacked the sharpness to make the extra man count. Dortmund simply reorganised, kept their shape, and denied their opponents the sight of goal that might have lent the closing stages some tension.

The dismissal will occupy the manager's thoughts in the days ahead, a note of indiscipline to be addressed. Yet with a two-goal cushion and a compliant opponent, the numerical disadvantage proved little more than a footnote to an otherwise commanding display.

What comes next

Victory lifts Borussia Dortmund to third on three points, their record immaculate through the opening weeks: one win, no draws, no defeats, two goals scored and none conceded. That clean sheet matters as much as the goals. It speaks of a side balanced at both ends, capable of striking early and then locking the door behind them, and it announces genuine ambition for the season ahead.

For Hamburg SV, the picture is bleak and clear. Sixteenth in the table, still on nought points, having shipped two goals across their opening game without reply of their own, they are already engaged in the kind of scrap they will have hoped to avoid. Promotion buys a place at the table but guarantees nothing once the football begins, and the early evidence is unforgiving.

The gap between these two sides on the afternoon was stark, and the standings now reflect it. Dortmund look every inch a team intent on challenging near the summit; Hamburg SV must find answers, and quickly, before the sense of a struggling season hardens into fact. There is time yet to correct course, but the margin for error is already narrowing.

For now, the Signal Iduna Park empties with its faithful satisfied. Guirassy leads the line with menace, the defence holds firm, and Dortmund march on. The red card aside, there was little here to trouble the home support, and plenty to suggest the best of this campaign is still to come.