Karim Adeyemi scored a first-half hat-trick as Borussia Dortmund hammered Celtic 7-1 in the Champions League on Tuesday, scoring their first five goals in the opening 42 minutes.

The 80,000-strong crowd started the celebrations early at the Westfalenstadion, with Emre Can scoring from the spot in the seventh minute after Celtic goalkeeper Kasper Schmeichel upended Jamie Gittens and was booked.

Celtic momentarily hushed the deafening Yellow Wall two minutes later when Daizen Maeda bundled in a cross from Arne Engels but Adeyemi restored the lead with a shot deflected in off Auston Trusty in the 11th minute.

The Germany winger extended the hosts' lead just before the half-hour mark when he lashed a shot into the top corner past a diving Schmeichel, then won a 39th-minute penalty for Serhou Guirassy to tuck away before completing his hat-trick three minutes later.

Guirassy grabbed his second goal of the night midway through the second half for last season’s Champions League runners-up.

BVB substitute Felix Nmecha then completed the rout with 11 minutes left, with Celtic having Schmeichel to thank for keeping the sobering scoreline to seven.

It is two straight wins for Dortmund to start this season’s competition, while Celtic have been brought emphatically back down to earth after putting five goals past Slovan Bratislava on Matchday One.

Data Debrief: Adeyemi matches Gomez feat

Gittens was Dortmund’s star man in their opening win against Club Brugge, but it was Adeyemi who came to the fore here, becoming only the second German player to score three goals in the first half of a Champions League match.

The only other such player to achieve the feat was Mario Gomez for Bayern Munich in 2011 against Napoli.

Guirassy, meanwhile, has joined Gittens and Adeyemi in making a fine start to the tournament, racing on to three goals with his double. 

Dortmund were rewarded for their attackers' accurate finishing, getting 13 of their 16 attempts on target and vastly outperforming their xG total of 2.91.