COLM GREAVES: Oisin Murphy and Roaring Lion take star billing

Leopardstown and the Curragh share hosting duties in the coming days for the newly annual flat racing extravaganza, the Longines-sponsored Irish Champions Weekend. Almost €5 million in prize money will be available much of it in 10 graded races, six of them Group One contests.

The courses began their meticulous preparations for this weekend a year ago and the only unknowns remaining are the stories that will emerge over the next couple of days. Here are four possibilities.