Formerly trained by the legendary Bart Cummings, the five-year-old lost for the first time in six races when just failing to see out the trip in the Melbourne Cup, in which he finished third.
The son of High Chaparral landed back-to-back victories in the Cox Plate, Australia’s premier weight-for-age race, last October before going on to secure his fifth Group One win in the Mackinnon Stakes.
O’Brien intends to aim him at all of Europe’s premier middle distance races in 2011.
Meanwhile, Harbinger and Frankel both earned notable Timeform ratings which will appear in their Racehorses Annual in March.
Harbinger posted the highest Timeform rating of the season with the 140 he recorded in the Betfair King George, in the process matching the figure posted by 2009 Horse of the Year Sea The Stars.
Frankel’s final figure of 133p is highest rating achieved by a juvenile since 1994. Both colts, along with ‘supermare’ Goldikova, will therefore be leading contenders for Timeform’s Horse Of The Year (revealed when the annual is published).
Timeform's leading middle distance performers in 2010:: 140 Harbinger, 133 Workforce, 132 Nakayama Festa, 130 Cape Blanco, Fame And Glory.
Leading milers in 2010: 133 Goldikova, 131 Canford Cliffs, 130 Makfi, 129 Rip Van Winkle, 127 Paco Boy, Cityscape, Dick Turpin.
Timeform's leading juveniles in 2010: 133p Frankel, 128 Dream Ahead, 121 Hooray, 119p Roderic O'Connor, 119p Pathfork, 119p Wootton Bassett, 118 Casamento.