ShareSamuele Inacio received a red card three minutes after coming on, but Borussia Dortmund eased to a 2-0 win over Hamburg.Borussia Dortmund survived going down to 10 men late on as they beat Hamburg 2-0 to open their 2026-27 Bundesliga campaign.Dortmund saw their title rivals Bayern Munich hammer Stuttgart 5-1 on Friday, and Niko Kovac's team did make a flying start at Signal Iduna Park.Serhou Guirassy needed just nine minutes to open his account for the season, tucking home after neat play from Bundesliga debutant Konstantinos Karetsas.Dortmund peppered Hamburg's goal from there, but Daniel Heuer Fernandes stood firm, making standout saves to deny Felix Nmecha and Karetas.However, Hamburg's luck ran out when, on the cusp of half-time, Giannis Konstantelias' wayward effort diverted in off Sebastiaan Bornauw.Patson Daka went close for Hamburg in the second half, hitting the post with a curling attempt, and the visitors were handed impetus in the 77th minute.Just on as a substitute, Samuele Inacio slid in late on Albert Gronbaek and received his marching orders. Hamburg, though, could not make their numerical advantage count.Karetsas the creatorBVB's new signing Karetsas provided 10 assists for Genk in the Belgian Jupiler Pro League last season – among all teenagers in Europe's top 10 leagues, only Barcelona's Lamine Yamal managed more assists (11).Across the Pro League, only Christos Tzolis, now at Arsenal, provided more assists (23) for Club Brugge in Belgium last season than Karetsas.And the Greek has already grabbed his first Bundesliga assist, with what was a crisp pass into the feet of Guirassy, who did the rest with an outstanding finish.Karetsas finished with a team-high three chances created, level with Jobe Bellingham, while he topped the charts for passes into the final third (21), dribbles (six) and successful dribbles (two).It marks a fine start to life at Dortmund for the winger, and Niko Kovac will feel his team were more than worthy winners, given they tallied up a whopping 20 shots, worth 1.41 expected goals overall.Dortmund have not lost any of their last eight Bundesliga meetings with Hamburg, winning six of those. This was just the start they were after.Samuele Inacio received a red card three minutes after coming on, but Borussia Dortmund eased to a 2-0 win over Hamburg.Borussia Dortmund survived going down to 10 men late on as they beat Hamburg 2-0 to open their 2026-27 Bundesliga campaign.Dortmund saw their title rivals Bayern Munich hammer Stuttgart 5-1 on Friday, and Niko Kovac's team did make a flying start at Signal Iduna Park.Serhou Guirassy needed just nine minutes to open his account for the season, tucking home after neat play from Bundesliga debutant Konstantinos Karetsas.Dortmund peppered Hamburg's goal from there, but Daniel Heuer Fernandes stood firm, making standout saves to deny Felix Nmecha and Karetas.However, Hamburg's luck ran out when, on the cusp of half-time, Giannis Konstantelias' wayward effort diverted in off Sebastiaan Bornauw.Patson Daka went close for Hamburg in the second half, hitting the post with a curling attempt, and the visitors were handed impetus in the 77th minute.Just on as a substitute, Samuele Inacio slid in late on Albert Gronbaek and received his marching orders. Hamburg, though, could not make their numerical advantage count.Karetsas the creatorBVB's new signing Karetsas provided 10 assists for Genk in the Belgian Jupiler Pro League last season – among all teenagers in Europe's top 10 leagues, only Barcelona's Lamine Yamal managed more assists (11).Across the Pro League, only Christos Tzolis, now at Arsenal, provided more assists (23) for Club Brugge in Belgium last season than Karetsas.And the Greek has already grabbed his first Bundesliga assist, with what was a crisp pass into the feet of Guirassy, who did the rest with an outstanding finish.Karetsas finished with a team-high three chances created, level with Jobe Bellingham, while he topped the charts for passes into the final third (21), dribbles (six) and successful dribbles (two).It marks a fine start to life at Dortmund for the winger, and Niko Kovac will feel his team were more than worthy winners, given they tallied up a whopping 20 shots, worth 1.41 expected goals overall.Dortmund have not lost any of their last eight Bundesliga meetings with Hamburg, winning six of those. This was just the start they were after.