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Monday was IndyCar team owner Michael Andretti’s 53rd birthday and son Marco was nowhere to be found – but with good reason.

The younger Andretti and Andretti Autosport teammate Ryan Hunter-Reay were both testing at Mid-Ohio Sports Car Course near Lexington, Ohio.

Also taking part in the test was Schmidt Peterson Motorsport’s James Hinchcliffe.

It was Hinchcliffe’s second successful test since recovering from his horrific crash during practice for this year’s Indianapolis 500 in May.

Hinchcliffe’s first test was last week at Road America in Wisconsin.

Monday’s test session was not open to the public or media, but a Honda source told Motorsportstalk that drivers and teams reportedly focused on testing aerodynamics for the 2016 Verizon IndyCar Series season.

Follow @JerryBonkowski