Niko Kovač started work as coach on Sunday, taking over from unbeaten interim coach Mike Tullberg, who stepped up from the club’s under-19s for three games after Nuri Sahin was fired.

BERLIN (AP) — 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. Leverkusen was ...