Starman won the July Cup at Newmarket, claiming the Group A race by a length and a quarter.
The four-year-old’s 9-2 shot ended a 7-2 victory over the favorite Dragon icon in second place.
Last year’s winner Oxted (11-2) was third, Art Power was slightly behind, and Creative Force finished fifth.
He’s inexperienced compared to a lot of those, but this horse is an absolute star,” winning jockey Tom Marquand told ITV Racing.
Starman coach Ed Walker needed a solid finish to win, as he seemed to have a lot to do for a long time, but the Duke of York Stakes winner came just in time to claim the victory.