Lambourn was cut for the Betfred Derby after winning the Boodles Chester Vase Stakes.
Sent off the 11/8 favourite, he was off the bridle four furlongs out and was third on the final turn behind the front-running Convergent and Lazy Griff (25/1).
The latter went to the front soon after but out three wide, Lambourn was finding top gear and overhauled his rival to win by a length-and-a-half.
Sky Bet, Betfair and Paddy Power all cut the winner to 14/1 for Epsom off the back of the performance and winning jockey Ryan Moore told ITV Racing: “He came forward today and was suited by the mile-and-a-half.
“It’s the first time I’ve ridden him in a race and he’s still learning a little about the job but is a relaxed horse who stays well and finds plenty off the bridle.”
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