Irish trainer Aidan O’Brien won his fourth English Derby after Ryan Moore steered Ruler Of The World (left) to victory at Epsom yesterday. The 7-1 chance finished 1-1/2 lengths ahead of Libertarian (14-1) with Galileo Rock (25-1) third. O’Brien won with Camelot last year when son Joseph O’Brien was in the saddle. His other Derby victories came with High Chaparral (2002) and Galileo (2001). O’Brien junior finished unplaced this time with Battle of Marengo while hot favourite Dawn Approach, running in Dubai ruler Sheikh Mohammed’s Godolphin colours, never settled and finished well beaten.