Group 1-winning filly Opera Singer (Justify) could be on course to make her eagerly anticipated return in the Irish 1,000 Guineas at the Curragh. Last year's leading juvenile filly ended her campaign with a five-length win in the Prix Marcel Boussac, a performance that placed her at the head of the ante-post market for the 1,000 Guineas at Newmarket. However, Opera Singer met with a setback which delayed her return but she is now all set to lead Aidan O'Brien's team at the Curragh. "At the moment for the 1,000...