Rombauer, the winner of the El Camino Real Derby at Golden Gate Fields in February, worked a half-mile in 48.80 seconds at Santa Anita on Friday in his first major exercise since finishing a well-beaten third in the Grade 2 Blue Grass Stakes at Keeneland on April 3.
The workout is part of preparation for the Kentucky Derby at Churchill Downs on May 1 or the Preakness Stakes at Pimlico on May 15.