Aidan O'Brien ended his record-breaking 2017 with 28 Group One winners, which broke Bobby Frankel's previous mark of 25 in a single season.
The trainer equalled Frankel's mark of 25 thanks to Hydrangea's victory in the Fillies & Mares at Qipco British Champions Day at Ascot and moved onto 26 when Saxon Warrior won a dramatic renewal of the Racing Post Trophy.
He struck gold with Mendelssohn in the Breeders' Cup Juvenile Turf while Highland Reel got the emotional 28th when bowing out before retiring to stud with victory in the Hong Kong Vase.
Here, we list all his Group One winners in 2017 with a selection of video clips while you can click on each race for the full result and full replay.
Aidan O'Brien's Group One winners in 2017
Click on each race for the full result & video replay
Churchill (Qipco 2000 Guineas) Newmarket, May 6
Clemmie (Juddmonte Cheveley Park) Newmarket, September 30
U S Navy Flag (Juddmonte Middle Park) Newmarket, September 30
Happily (Prix Jean-Luc Lagardere) Chantilly, October 1
Rhododendron (Prix de l'Opera) Chantilly, October 1
Roly Poly (Sun Chariot Stakes) Newmarket, October 7
US Navy Flag (Darley Dewhurst Stakes) Newmarket, October 14
Hydrangea (Fillies and Mares) Ascot, October 21
Saxon Warrior (Racing Post Trophy) Doncaster, October 28
Mendelssohn (Breeders' Cup Juvenile Turf), Del Mar, November 3
Highland Reel (Hong Kong Vase), Sha Tin, December 10
Aidan O'Brien's most prolific Group One winning horses in 2017
4 - Winter
3 - Roly Poly, Highland Reel
2 - Churchill, Happily, U S Navy Flag, Hydrangea, Capri
1 - Wings Of Eagles, Caravaggio, Sioux Nation, Order Of St George, Clemmie, Rhododendron, Saxon Warrior, Mendelssohn
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