Overview
- Julian Brandt stepped in late for Serhou Guirassy and assisted Daniel Svensson and Karim Adeyemi for first-half goals.
- Mainz goalkeeper Robin Zentner was sent off in the 67th minute for tripping Adeyemi as the last defender.
- Borussia Dortmund posted a fourth straight Bundesliga clean sheet under Niko Kovač.
- The victory keeps Dortmund unbeaten and two points behind Bayern Munich after five matches.
- Guirassy withdrew in the warm-up with a thigh problem and is a doubt for Wednesday’s Champions League match against Athletic Bilbao, while Fabio Silva made a late competitive debut.