BERLIN — Borussia Dortmund surged level on points with Bayern Munich and Schalke at the top of the Bundesliga on Sunday following a 5-1 rout at Hamburger SV in the first round after the winter break.
Robert Lewandowski and Jakub Blaszczykowski both scored twice as Dortmund inflicted Hamburg coach Thorsten Fink's first league defeat after eight games unbeaten.
"We played very badly. We don't need to analyze it too much," Fink said.
Kevin Grosskreutz scored in the 16th minute for the visitors, Lewandowski found the net in the 37th and set up Blaszczykowski in the 58th.
Blaszczykowski, Poland's captain, claimed his second from the penalty spot in the 76th, before Lewandowski added another goal in the 83rd for the defending champions.
Jose Paolo Guerrero scored an 86th-minute consolation for the hosts.
Dortmund climbs ahead of Schalke to second behind Bayern on goal difference, while Moenchengladbach is a point behind the top three.
"Bayern are favorites and they stay favorites," Grosskreutz said.
Bayer Leverkusen hosts Mainz in Sunday's late game.
Many Dortmund fans traveled to Hamburg but remained outside the stadium to protest against the cost of entrance prices, which start at €19 ($24.60) for a standing ticket.
Despite playing without playmaker Mario Goetze due to a groin injury and goalkeeper Roman Weidenfeller because of a back problem, Dortmund made a blistering start.
Wonderful play from Shinji Kagawa created the opening goal, the Japan midfielder eluding the Hamburg defense with a swerve before finding the unmarked Grosskreutz to shoot past goalkeeper Jaroslav Drobny.
Guerrero had the chance to equalize a minute later but headed wide from close range.
Lewandowski had a goal ruled out for fouling Lukasz Piszczek but he scored a fine individual effort. He played the ball through Heiko Westermann's legs, eluded Dennis Aogo before knocking it beyond the helpless Drobny.
Blaszczykowski effectively decided the matter when Lewandowski set him up to drill a low shot into the bottom corner of the goal.
When Dennis Diekmeier brought down substitute Moritz Leitner, Blaszczykowski seized the chance to make it 4-0.
"'Kuba' wanted to score his first double for 400 years," Dortmund coach Juergen Klopp said.
Lewandowski then claimed his 14th goal of the season after combining brilliantly with Grosskreutz to leave the Hamburg defense standing.
Guerrero's late strike barely provoked a response from fans inside the stadium. Outside, those listening on the radio already had the celebrations under way.
"I don't think Hamburg had a chance," Dortmund captain Sebastian Kehl said.