Bosnian champions Zrinjski Mostar lost 1-0 to Ludogorets Razgrad in the first leg of the UEFA Europa League third qualifying round.
Bulgarians were heavily favored before the match, and they dominated for most of the game - but scored only once, in the 16th minute when Romanian defender Cosmin Moti headed home a corner kick by Wanderson to give Ludogorets a clean sheet victory.
The second leg will be played next Thursday at the Pecara Stadium in Siroki Brijeg.
Winners will face Torpedo Kutaisi of Georgia or last year’s Albanian runners-up FK Kukesi in the Europa League play-offs. Torpedo won the first leg 5-2.