Owned by Sheikh Ahmed Al Maktoum, the son of Showcasing ran only once as a juvenile, finishing third in a warm York maiden over six furlongs, the form of which has worked out well.
Stepped up in trip and switched to an artificial surface here, Horroob made no mistake under Andrea Atzeni, sitting third on the rail before moving up to challenge inside the final quarter mile.
The Richard Hannon-trained My Tyrell led the seven-strong field turning for home, but Horroob always looked like bridging the gap and he did so under a hands and heels ride, scoring by a length and three quarters at the line.
Roger said: “Horroob is a horse I like and this was the perfect way to start his campaign. He travelled nicely and picked up well and I hope he will continue to progress through the ranks in handicaps.”