The partnership between Merisi Diamond and jockey Ronan Whelan has been the horse's best asset. Whelan has ridden the horse 14 times and won on 4 of those occasions — a 29% win rate, nearly one and a half times better than Merisi Diamond's baseline. Whelan clearly knows how to get the best from this horse, and when the pair line up together on a wet track, they represent genuine value. Trainer Thomas Coyle, based at Batterstown in County Meath, has saddled the horse throughout its career, and the yard has sent out just two winners this season, suggesting Merisi Diamond is among its more reliable performers.
Merisi Diamond shows a marked liking for Roscommon, where it has won 2 of its 5 races — a 40% win rate at that track. The horse's most recent victory came at The Curragh on 19 April 2026, four months ago, but recent form has been inconsistent. In its last six races it has finished fifth, first, third, seventh, sixth, and fourteenth, which tells the story of a horse that can still find the winning post but is far from a consistent force. Still active and racing just a day ago, Merisi Diamond remains a capable performer for a trainer who can place it on wet ground at the right course.
| Course | Races | Results | Last visited | Win rate |
|---|---|---|---|---|
| The Curragh Galloping |
14 | 3 wins, 1 second, 1 third, 9 other | 19 Apr | 21.4% |
| Roscommon Sharp |
5 | 2 wins, 3 other | 31 Aug | 40% |
| Navan Galloping |
2 | 2 other | 4 Oct | 0% |
| Naas Galloping |
2 | 2 other | 22 Mar | 0% |
| Limerick Galloping |
1 | 1 other | 25 Apr | 0% |
| Leopardstown Galloping |
1 | 1 second | 10 Apr | 0% |