Freiburg reach the end of four straight weeks with midweek football, and Julian Schuster isn't hiding it: "we've had very intense days in recent weeks, you can feel it." Union, meanwhile, have had a full week off since the 1-1 with Köln. On its own that points one way, but Union travel without three of their centre-backs, and a rested team with an improvised back line is not the same thing as a rested team. I see this as a test of which cracks first: tired legs or an unfamiliar defence.
The Freiburg side of it first. They come in three days after a 1-0 win in Trabzon that Schuster called their best defensive performance of the season, which is fair, but our match stats show how much they had to lean on it: 37% possession, 12 shots to 15, and 0.99 xG against 1.67, with Backhaus busy. The 2-1 at Augsburg before that was also level on chances (1.39 to 1.45). Schuster says a few players finished in Trabzon with knocks, nothing major, and Goal reports Osterhage and Muslija out. Those are wins earned on organisation rather than control, and organisation is the first thing fatigue eats into.
Union's problem is personnel. The club confirms Nsoki, Uduokhai (suspended), Kemlein and Skov won't travel, and Markgraf is still out with his knee, so Goal's predicted back three is Köhn, Friedrich and van den Bosch. That matters because Union's recent draws were built on suffering without the ball: 34% possession and 25 shots faced at Augsburg, 37% and 14 faced against Köln. A deep block depends on defenders who know each other's movements. And they don't have much going the other way to punish a tired opponent, with 7 goals in 8 league games.
Two things keep me from calling it one-sided. Union won both of their last two Bundesliga visits to Freiburg, and Schuster himself expects a very physical game, which is the kind Union are comfortable dragging out. My guess is that Freiburg throw most of their energy at the first hour with the break in sight; if Union's makeshift back three are still level after that, the seven days against three start to count.