Irish trainer Aidan O'Brien has equalled Bobby Frankel's world record 25 Grade/Group One winners in a calendar year with the win of Hydrangea at Ascot.

Aidan O'Brien's Group One wins in 2017:

Churchill (2000 Guineas) Newmarket, May 6

Winter (1000 Guineas) Newmarket, May 7

Churchill (Irish 2,000 Guineas) Curragh, May 27

Winter (Irish 1,000 Guineas) Curragh, May 28

Highland Reel (Coronation Cup) Epsom, June 2

Wings Of Eagles (English Derby) Epsom, June 3

Highland Reel (Prince of Wales's Stakes) Ascot, June 21

Caravaggio (Commonwealth Cup) Ascot, June 23

Winter (Coronation Stakes) Ascot, June 23

Capri (Irish Derby) Curragh, July 1

Roly Poly (Falmouth Stakes) Newmarket, July 14

Roly Poly (Prix Rothschild) Deauville, July 30

Winter (Nassau Stakes) Goodwood, August 3

Sioux Nation (Phoenix Stakes) Curragh, August 13

Hydrangea (Matron Stakes) Leopardstown, September 9

Happily (Moyglare Stud Stakes) Curragh, September 10

Order Of St George (Group Irish St Leger) Curragh, September 10

Capri (English St Leger) Doncaster, September 16

Clemmie (Cheveley Park) Newmarket, September 30

US Navy Flag (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 (Dewhurst Stakes) Newmarket, October 14

Hydrangea (British Champions Fillies & Mares) Ascot, October 21