Guirassy scores four as Dortmund bursts into life
Serhou Guirassy scored four goals as Borussia Dortmund inflicted a 6-0 rout on Union Berlin at Signal Iduna Park to provide new boss Niko Kovac with an emphatic first league win.
Maximilian Beier was also on target to help Dprtmund record only its second victory in eight Bundesliga matches.
The hosts broke through in the 25th minute when Julian Ryerson's shot deflected in via Diogo Leite, while Guirassy headed home Pascal Gross's cross to double the lead five minutes before the break.
The striker added his second with a quarter of an hour remaining, before completing his hat-trick five minutes later.
Guirassy headed in another Gross cross for his fourth goal, while Beier struck in the dying seconds to put the seal on Kovac's first league win in charge.
Scoring four goals in a match for the first time in his career, Guirassy became the third Dortmund player this millennium to do so in a Bundesliga game after Pierre-Emerick Aubameyang and Erling Haaland.
Gross, meanwhile, claimed four assists and is the third player to achieve that feat in a Bundesliga match since data collection began in 2004-2005, after Christopher Nkunku and Szbabolcs Huszti.
