Herrera was Mexico's national champion in the 12s, 14s and 16s junior events. He partnered
Mark Knowles in the Boys' Doubles at the
1989 French Open and they finished runners-up. He broke into the top 100 for the first time in 1991, after some good performances on the
ATP Tour. Herrera reached the semi-final of the
Seoul Open and the quarter-final
in Washington. En route to the Washington quarter finals he defeated
John McEnroe. He also won the gold medal at the
1991 Pan American Games, held in
Cuba. In 1992, he reached the third round of the
Wimbledon Championships, having beaten veteran
Jimmy Connors in four sets and Japan's
Shuzo Matsuoka in five sets. This was the furthest a Mexican had gone at Wimbledon since
Raúl Ramírez reached the quarters in 1978. 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. 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. Soon after he made the semi-finals of
the tournament in Newport. He played a total of 26 singles matches and four doubles matches for the
Mexico Davis Cup team, for an overall record of 13–17. == ATP career finals==