Dortmund build an early lead and protect it with ten men against Hamburg

Serhou Guirassy and Giannis Konstantelias scored before half-time, then Dortmund managed the final phase after Samuele Inacio’s red card.

High pressure produced an immediate reward

Dortmund began the Bundesliga season by pressing Hamburg high and refusing easy passes from the back. The first goal arrived in the ninth minute. Konstantinos Karetsas combined with Serhou Guirassy, who finished from inside the penalty area. The early lead allowed Dortmund to keep the same aggressive shape without chasing the match.

Hamburg struggled to move the ball beyond the first line. Dortmund’s midfield collected second balls and restarted attacks before the visitors could spread out. The pressure was effective because the players behind Guirassy stayed close enough to support both the press and the next pass.

Konstantelias scored on his full debut

The second goal came in first-half stoppage time. Maximilian Beier found Giannis Konstantelias from the left, and the new signing’s shot took a deflection off Sebastiaan Bornauw before crossing the line. The Bundesliga credited the goal to Konstantelias.

Scoring just before the interval changed Hamburg’s task. One goal could have reopened the contest, but two required a more ambitious second half. Dortmund could choose when to press and when to protect the area in front of the defence.

Hamburg improved after the break

The visitors had more possession and carried a greater threat in the second half. Patson Daka came close to reducing the deficit, and Dortmund spent longer periods without the ball. The shift did not erase the first-half performance, but it showed that the match was not a continuous ninety-minute attack from the home side.

Dortmund adjusted by defending deeper and limiting clear shots. The team accepted that some control would come through position rather than possession. Keeping Hamburg outside the best central spaces became more important than forcing another early goal.

A substitute’s red card changed the final phase

Samuele Inacio received a straight red card in the 77th minute shortly after entering the field. Dortmund had to finish with ten players. The incident did not alter the score, but it increased the defensive work required during the closing minutes.

Hamburg pushed forward, while Dortmund reduced unnecessary risks. Wide players dropped closer to the back line and the hosts cleared the first ball before trying to build another attack. The response was disciplined enough to preserve both the lead and the clean sheet.

New players affected the opening result

Karetsas supplied the pass for the first goal, and Konstantelias scored the second. Their influence gave Dortmund an immediate return from changes made before the season. Guirassy remained the central reference and converted the first clear opening.

A single match cannot settle the long-term value of a signing, but it can show how the roles fit. Karetsas connected the central attack, Konstantelias entered from the side, and Beier created the second goal. The movements were different enough to prevent Hamburg from defending one route.

The opener ends with a simple result

Dortmund won 2-0 through goals in the ninth minute and first-half added time. The red card came later and did not produce a Hamburg comeback. Those events belong to one clear sequence: strong home start, two-goal lead, improved visiting pressure and controlled defence with ten men.

The next step is to keep the first-half intensity without needing a difficult final spell. For the opening round, Dortmund earned three points, introduced new attacking connections and protected the result after the match became less comfortable.