US Army Ranger out to prove Derby credentials

Aidan O’Brien believes US Army Ranger will have to take another step forward if he is to maintain his unbeaten record in the MBNA Chester Vase.

Despite having not raced as a two-year-old, the son of Galileo was promoted to ante-post favourite for the Investec Derby after making a winning debut at the Curragh last month.

Should the three-year-old, who is one of two entries for O’Brien along with Port Douglas, claim this Group Three prize and go on to win at Epsom, it would see him follow in the hoofprints of 2013 Derby winner Ruler Of The World who took the same route.