Circuit Showdown was a Philippine auto racing series that began in 2010 and was organized by Enzo Pastor and Dalia Pastor.

[1] It was the only circuit racing series in the country that is open to both amateur and professional drivers.

[citation needed] The series runs throughout the year alternating between the major race venues in the Philippines, including the Clark International Speedway (CIS), and the Batangas Racing Circuit.

In 2010, the series ran a few legs on the now defunct Subic International Raceway (SIR).

[2][3] Teams from all over the country ranging from car clubs to manufacturers participate.