'Endurance test' as struggling Dortmund tackle in-form Wolfsburg

Dortmund, who lost the title to Bayern Munich on the final day of last season, have started this season poorly by their standards and were 2-0 losers at PSG in the Champions League in midweek. They may still be unbeaten in the league but have laboured to two wins and two draws all of which have come against teams in the bottom half of the table.
On Saturday, Edin Terzic's men take on Wolfsburg, who look refreshed under former Bayern coach Kovac, now in his second year in the Auto City. Noted disciplinarian Kovac's well-drilled side have won three of four this season to sit one point ahead of Dortmund in the table. One saving grace, however, for the home side on Saturday is their dominant recent record, not only head-to-head with Wolfsburg, but against Kovac-coached teams.
Wolfsburg have won just one of their past 16 games against Dortmund dating back to the 2015 German Cup final, which the Wolves won 3-1. In that match, Kevin de Bruyne, in his final match for Wolfsburg, carved up Dortmund, who were also bidding farewell to coach Jurgen Klopp.
Wolfsburg have not won at Dortmund's Signal Iduna Park since 2012 and Kovac has lost all four games at the venue as coach of Wolfsburg, Bayern and Eintracht Frankfurt. Speaking on Thursday, Kovac said simply "at some point these runs will come to an end".
Kovac called on his side to "be courageous" in the "endurance test", saying "when you act fearful in Dortmund it gets very difficult". Bayern Munich, Bayer Leverkusen and RB Leipzig fill the top three places in the table with just one loss between them. Harry Kane-powered Bayern may have met their match in last Friday's 2-2 draw with Xabi Alonso's impressive Leverkusen who lead the way on goal difference.
RB Leipzig have burst out of the blocks under former Dortmund mentor Marco Rose, scoring 19 and conceding just five in six competitive matches this season.

Fixtures (13.30 GMT unless stated)
Friday
Stuttgart v Darmstadt (18.30)
Saturday
Augsburg v Mainz, Bayern Munich v Bochum, Borussia Moenchengladbach v RB Leipzig, Borussia Dortmund">Borussia Dortmund v Wolfsburg, Union Berlin v Hoffenheim, Werder Bremen v Cologne (16.30)
Sunday
Bayer Leverkusen v Heidenheim, Eintracht Frankfurt v Freiburg (15.30)