Andorra 0-3 Bulgaria
Having beaten Andorra 3-0 on Saturday in their qualifying Group 2 opener, Mihail Madanski's team repeated the achievement at the Estadi Comunal.
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Todor Nedelev struck twice as Bulgaria consolidated their early leadership of UEFA European Under-21 Championship qualifying Group 2 with a second 3-0 victory against Andorra in four days.
The Bulgaria captain, on target when the teams met on Saturday in Lovech, opened the scoring from the spot in first half added time after Radoslav Kirilov was fouled by Walid Bousenine.
The hosts' defence was breached again eight minutes into the second period when Kirilov capped some fine individual play with a neat finish. Nedelev lobbed in the third with a little over a quarter of an hour remaining.
Bulgaria are not in action again until 6 September when they host Estonia, who face Andorra in Tallinn on Tuesday.