Has a Top Rank prospect ever been exposed in the beginning of his career?

[wazaa.]

Did a highly thought prospect of Top Rank ever lose a fight before he fought for a world title? In other words, was he exposed by a fighter he should have beaten comfortably?

Frank Warren: Amir Khan
Golden Boy Promotions: Victor Ortiz and Daniel Jacobs

I can't think of one...but then again, I have started following boxing since 2007. .