He holds the record for the best debut ever by a Mexican driver[1] in a premiere open-wheel series (IndyCar, Champ Car World Series, F1) with his 9th place finish at the 2006 Gran Premio Telmex (a record he now shares with Patricio O'Ward, who also finished 9th on debut at the 2018 Indycar Grand Prix of Sonoma).

[citation needed] In 2006, Martínez joined Forsythe Championship Racing in Mexico City to pilot the Lola-Ford-Cosworth in his Champ Car debut.

Initially announced to race a third car for the team, he ended up replacing an injured Paul Tracy and finished 9th, the best debut by a Mexican driver in a premiere open-wheel series.

[citation needed] He was idle throughout most of 2007, but was announced as the driver of Forsythe's #7 car for the final two races of the season, including a return to Mexico City.

In 2009 his only professional outing was in the 24 Hours of Daytona driving Beyer Racing's Riley-Pontiac to a 10th place DP-class finish.