The home side controlled the possession for the vast majority of the game and subjected us to numerous attacks.
It was Dortmund's top marksman Pierre-Emerick Aubameyang who put them in front on the half-hour mark and, after Gonzalo Castro hit the outside of the post, Marco Reus netted an emphatic brace to put the Bundesliga outfit firmly in control ahead of the second leg next week.
Borussia Dortmund (3-4-3): Weidenfeller; Piszczek, Bender (Subotic 57), Hummels (c); Durm, Weigl, Castro, Schmelzer; Mkhitaryan, Aubameyang (Kagawa 82), Reus (Ramos 82). Substitutes (not used): Burki, Leitner, Ginter, Sahin.
Spurs (4-2-3-1): Lloris (c); Trippier, Alderweireld, Wimmer, Davies; Carroll, Mason; Onomah, Eriksen (Lamela 65), Son (Kane 76); Chadli (Dembele 57). Substitutes (not used): Vorm, Carter-Vickers, Walker, Bentaleb.
Goals: Borussia Dortmund – Aubameyang 30, Reus 61, 70.
Yellow cards: Spurs – Carroll 35, Lamela 67.
Referee: Cüneyt Çakır.