By the time Erling Haaland came off the bench, FC Augsburg had had 12 shots compared to Dortmund's eight. With the Norwegian on the pitch, the shot count read 9-1 to the visitors. The number 17 netted three times on his debut – just as former No. 17 Pierre-Emerick Aubameyang once did in Augsburg. Here are the match facts.
Solid start: Borussia Dortmund have not lost the opening Bundesliga game of a calendar year since 2004. There have been 11 wins and five draws in that period.
Favourite foes: BVB went behind in both games against Augsburg this season but came back to win on both occasions, scoring 10 goals in total (5-1 and 5-3).
Dream debut: Erling Haaland is the seventh Bundesliga player (second from BVB after Pierre-Emerick Aubameyang) to score three goals on his debut. "Auba" also netted a hat-trick on his debut away to FC Augsburg in August 2013.
Second-youngest: Only one player younger than BVB's new signing has ever scored three goals in a game in the Bundesliga. That was Walter Bechtold, who netted a hat-trick for Eintracht Frankfurt at the age of 18 in 1965.
Quickest debutant: Haaland came off the bench in the 56th minute and had three goals within 23 minutes. No player has ever scored a hat-trick so quickly on their debut. He converted all three shooting opportunities he had – each of them with his left foot.
First BVB scorer from Norway: Haaland is the first man from Norway to score a Bundesliga goal for BVB. None of his three compatriots who played before him – Andre Bergdölmo, Jan Derek Sörensen and Steinar Pedersen – managed to find the net.
Favourite foe: The previous hat-trick by a substitute in the Bundesliga was scored by Paco Alcácer in October 2018 – also for BVB, also against Augsburg.
First away goal: Julian Brandt netted his seventh competitive goal for BVB but his first away from home. Two of his three Bundesliga goals for the Black & Yellows have come against FCA (he scored the final goal in a 5-1 win in the reverse fixture).
Shooting boots: Jadon Sancho has scored nine goals in his last nine competitive matches.
Fifth-youngest: Giovanni Reyna, born on 13 November 2002, is the fifth-youngest player to have ever made a Bundesliga appearance – behind Nuri Sahin, Yann Bisseck, Jürgen Friedl and Ibrahim Tanko.