Inform Guinean International Serhou Guirassy scored four goals to lead Borussia Dortmund to a 6-1 victory over Union Berlin, giving Niko Kovac his first win as head coach.

Dortmund went ahead in the 25th minute when Union’s Diogo Leite deflected a shot from Julian Ryerson into his own net. Guirassy scored his first goal in the 40th minute with a header from Pascal Gross’s cross and added another in the 75th minute, also set up by Gross.

Maximilian Beier assisted Guirassy’s hat-trick goal five minutes later, and Guirassy completed his scoring with a header in the 83rd minute, bringing his season total to 13 league goals.

Beier finished the scoring in the 89th minute. Gross’s four assists marked the first time in five years that a player achieved this feat in the Bundesliga. Nico Kovac, who took over as coach in January, has Dortmund in 10th place with 32 points as they prepare to face Lille in the Champions League next month.