He partnered Mark Knowles in the Boys' Doubles at the 1989 French Open and they finished runners-up.

He also won the gold medal at the 1991 Pan American Games, held in Cuba.

He also made it into the semi-finals of the Manchester Open and along the way defeated second-seed Brad Gilbert, in a close three-set match which was decided in a tie break.

However his most successful outing in 1992 came at Búzios, where he reached his only ATP Tour singles final.

[1] Herrera had his third and final Grand Slam win in the 1993 Wimbledon Championships when he came from two sets down to defeat 15th-seed Karel Nováček in the opening round.