Dortmund pressed forward but had to wait until the 31st minute before the good build-up work and pass into the box from Giovanni Reyna allowed Haaland to break the deadlock with a hammer from close range.
Berenguer will cost around 12 million euros (about 14.05 million U.S. dollars) and is contracted to Athletic Bilbao until the end of June 2024.
Newly promoted Elche and Huesca drew 0-0, although Huesca was the better side as Elche failed to get a shot on target.
Cadiz had lost their previous 13 league visits to Athletic Bilbao.
As for player updates, Germany's Han Ying enters the action at the Women's World Cup in place of Australia's Melissa Tapper, and Germany's Patrick Franziska replaces Australia's Hu Heming to participate in the Men's World Cup. Enditem
"It's because I did a lot of things well. I played more aggressively than the previous days. I went to the net more often, and I hit a lot of winners," added the 12-time French Open champion, who needed only one hour and 35 minutes to see off his opponent.
The five-time SBL champion Inter Bratislava, who was to grab its sixth before the pandemic forced the season to end prematurely without a champion crowned, put on a solid start in Lucenec, leading by three points after the introductory period but the home team turned things up a notch and won all the remaining periods under the leadership of the American guard Dominique Hawkins who led the scoring department with 27 points.
Against Huesca and Villarreal, Atletico showed their old problems as they struggled to create chances against well-organized rivals, while Suarez looked sluggish.
Union gained momentum but missed the chance to extend the lead at the half-hour mark after Nico Schlotterbeck pulled wide from tight angle.
Despite two big losses into the season, Daqing coach Ji Yanyan would rather pick up something positive from her young team.
Arsenal continued its positive start to the season with a 2-1 win at home over Sheffield United, but Mikel Arteta's side had to endure a frantic end to its game after David McGoldrick curled home a spectacular 83rd minute goal for the visitors.