Match - Sun 16 December, 00:00,
Heart of Lions hand Hearts another defeat
The visitors had chances to register the first goal but their attack without Mahatma Otoo appeared blunt.
Otoo is on trial at Turkish Super Lig side Denizlispor and Hearts were without midfielder Laryea Kingston.
Lions opened the scoring after 36 minutes when Kwame Bonsu volley home from close range.
Duncan urged his men to go for the equaliser before the break but they failed to hit the target.
Things turned sour for the Phobians in the 78th minute when defender Godwin Osei Bonsu directed a corner-kick into his won net.
The score line could have been more than two but for the agile goalkeeping from Hearts of Oak's Tetteh Luggard.
Hearts coach David Duncan has now suffered two defeats in five matches.