Omar joins the likes of young swimmers Kaya Forson and Abeiku Jackson as well as Hungarian-born judoka who to have lost-out on their debuts.
In a post fight interview, Omar said he believed he won the fight although he came-up against a very experienced opponent.
The games continue today with weightlifter Christian Amoah in action at the Riocentro-Pavilion 2 in the 85 kilogramme category.
Other member of Team Ghana who will take to the track today include sprinters, Sean Safo-Antwi, Flings Owusu-Agyapong and Emmanuel Dasor.