A superb first half performance saw BVB earn an impressive result over HSV in their season opener. Mario Gotze claimed a goal and an assist, while Kevin Grosskreutz struck a brace
BVB took the lead with their first clear chance of the game, which took more than 16 minutes to arrive. Kevin Grosskreutz made a surging run from deep to meet Mario Gotze's through ball, and the 23-year old coolly finished off the post.
Gotze turned scorer on the half hour mark as he received a clever back-heel from Robert Lewandowski and netted past the onrushing Jaroslav Drobny.
Moments after the break, Gotze played a lovely one-two with Sven Bender before setting up Grosskreutz, who, after having his initial attempt blocked, fired in the third goal.
After Marcell Jansen's header was cleared off the line, Robert Tesche pounced on a loose ball to pull back a goal for Hamburg. However, it came on 79 minute and was too late for the visitors to mount a comeback.
Shinji Kagawa was unfortunate not to find his name on the score sheet in the first half; the Japanese playmaker had a long-range effort fly narrowly wide shortly before the opener, and he had another later attempt miss narrowly wide after superb lead-up play by Grosskreutz. However, he came closest in the 25th minute, when after a few clever touches he rattled the right post with a powerful drive.
Late in the first half, Gotze and Robert Lewandowski linked up very well to set up Ilkay Gundogan, but the new signing had his shot miss wide.
Hamburg's only real chance of the half came in the opening moments, when Gokhan Tore made a nice run before finding Mladen Petric open at the edge of the box. However, the Croatia international sliced his shot well off target.
If the visitors had any hopes of reducing their deficit after the interval, they took a severe blow when Grosskreutz netted the third. Petric had another opportunity on 56 minutes after a good cross from the substitute Jansen, but the 30-year old's effort was deflected wide.
Hamburg grew in confidence late in the game, especially after Tesche's goal. Seconds after the restart, Tore made an impressive run before releasing Jansen, but the Germany international had his low drive saved.
Dortmund regrouped and did well to keep their opponents silent in the closing minutes as they claimed an impressive victory.
The result sees BVB pick up where they left off in May, atop the Bundesliga table. Hamburg were out-played in the first half, but can take some encouragement for their performance after the break.