Bayer Leverkusen has been dealt a major blow to its Bundesliga title defense, and Borussia Dortmund’s malaise has continued through Niko Kovač’s debut as coach.

Bayer Leverkusen dropped eight points behind league leaders Bayern Munich with a scoreless draw at Wolfsburg on Saturday.

Coach Niko Kovac made his debut for Borussia Dortmund with a 2-1 defeat at home against VfB Stuttgart on Saturday in the ...