Luisant swooped inside the final furlong to land a big pot in the BAR ONE Racing Handicap at Dundalk.
Colm O'Donoghue produced his mount on the outer to lead inside the final 100 yards and record a two-length victory over 7/2f Soap Wars in the €42,500 event.
"That's by far my biggest win yet as a trainer," said a delighted James Nash afterwards.
"He was unlucky last time at the Curragh but was lucky to get in here today.
"Thank God at last he has shown everybody else what he shows me at home all the time."
