Dortmund's Erling Braut Haaland celebrates after scoring against Schalke 04 on Saturday in Dortmund, Germany. Photo: VCG

Borussia Dortmund provided much-needed fireworks with a 4-0 demolition of bitter rivals Schalke 04 on Saturday after the German league restarted in front of empty stands after a suspension of over two months due to the COVID-19 pandemic.

The Bundesliga is the first major football league to return to action since the virus earlier this year shut down sports, and its return in a country that still has hundreds of positive virus cases a day is being closely watched by other leagues.

With a strict health protocol governing the fragile restart, which includes no fans, face masks for everyone but the players, no handshakes and no group celebrations, it was up to title hopefuls Dortmund, who host leaders Bayern ­Munich in 10 days' time, to find a spark badly missing in the eerily empty ground.

The Ruhr valley club, in second place, scored the first goal of the matchday ­after nearly half an hour when ­teenager Erling Haaland connected with a Thorgan Hazard cutback.

The exciting 19-year-old Norway striker, who knocked in his 13th goal in 12 appearances for Dortmund in all competitions, picked up exactly where he left off in March.

He is already at the top of the transfer wish list of every major European club and, with an expected television audience of 1 billion for the Bundesliga this weekend, his immediate return to scoring will have enhanced his already stellar reputation.

Portuguese midfielder Raphael Guerreiro added two more goals and Belgium international Hazard also got on the scoresheet as Dortmund climbed to 54 points, one behind defending champions Bayern, who are in ­action at Union Berlin on Sunday.

"I'd have preferred if the ­conditions were normal," Dortmund midfielder Julian Brandt said. "We all have to adapt and try to have fun under the ­circumstances. We did that pretty well today and what better way to restart the league than with a win."

While Dortmund's comfortable victory cranked up the pressure on leaders Bayern, RB Leipzig suffered a major setback in their title challenge when they were held to a 1-1 draw at home to Freiburg as they slipped to fourth.

Borussia Moenchengladbach overran hosts Eintracht Frankfurt with early goals from Alassane Plea and Marcus Thuram and a late Ramy Bensebaini penalty to win 3-1 and take over third spot on 52 points to maintain their outside shot at winning the title.

VfL Wolfsburg reignited hopes of Europa League football next season with a 2-1 win at Augsburg courtesy of Daniel Ginczek's stoppage-time winner that moved them up to sixth on 39.

Fans across the country followed police orders to stay away from the stadiums, including at the Ruhr derby, as the league tries to finish the season for contractual reasons by June 30.