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Leroy Sane scored twice and Nick Woltemade and Serge Gnabry also struck in a dominant first half that saw Germany quickly seal victory and secure top spot in Group A to automatically qualify for next year's tournament.

The four-time World Cup-winner, which crashed out in the first round of the last two editions of the iconic tournament, finished top of its group on 15 points, with the Slovaks second on 12.

"Every player gave it all," Germany coach Julian Nagelsmann said. "We played a really great game. We worked very hard. We scored great goals and were convincing with our game.

"Today there is no reason to complain," he said. "There was pressure and they pushed themselves and showed a great team spirit. I am proud of the team."

The Germans, needing a draw or a win to secure top spot, left nothing to chance and shot out of the blocks to take control early. Unmarked Woltemade headed in for the lead in the 18th minute with his fourth consecutive goal in the last three matches for Germany.

Serge Gnabry should have doubled it when he charged into the box but his low shot was blocked by Slovakia keeper Martin Dubravka in the 25th. Gnabry made amends four minutes later as he latched onto a perfect Leon Goretzka pass to make it 2-0.

An equally quick move saw Florian Wirtz put Leroy Sane through in the 36th to curl his shot past Dubravka and put the game to bed before Wirtz delivered another assist for the winger to bag his second goal of the evening five minutes later.

Slovakia, which had beaten Germany in Bratislava in September, had no answer to the host's relentless pressure.

"From the first to the last second we did not allow anything at the back and were creative," Woltemade said. "I hope it was fun to watch us tonight. It is great to play for Germany. We have now qualified for the World Cup."

The pace dropped after the break but substitutes Ridle Baku and 19 year-old Assan Ouedraogo added a goal apiece, with the latter becoming the youngest player to score for Germany on his debut.

The Germans, who have qualified for the World Cup for the 21st time, second-most after Brazil's 23, have openly set their goal of winning the World Cup, co-hosted by Mexico, United States and Canada, to restore their dented reputation as a global football powerhouse.

They have not reached a final in any major international tournament since winning their fourth World Cup in 2014 in Brazil.