When Borussia Dortmund steps onto the pitch at Signal Iduna Park this Sunday, August 31 (11:30 AM ET), they’ll carry the momentum of a red-hot start to the 2025-26 Bundesliga season—five matches in, and Edin Terzić’s side has dropped just one result. But standing in their way is a 1. FC Union Berlin side that refuses to be an easy out, arriving in Dortmund with grit, resilience, and a knack for stealing points from the league’s elite. After a summer of transition, Union’s WWLDD form proves they’re still the scrappy underdogs no top team wants to face.

The contrast in styles will make this a fascinating tactical duel: Dortmund’s high-octane attack, fresh off four straight wins, against Union’s organized, physical defense that’s already frustrated bigger names this season. With the Black and Yellows looking to cement their title ambitions early and Union eager to prove they belong in the top-half conversation, Sunday’s clash isn’t just about three points—it’s a test of whether Dortmund’s early dominance is sustainable against a side that thrives on chaos. Buckle up; this one could be fireworks.