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Austin and Ty Dillon substitute for sidelined drivers at Chicagoland Speedway

O'Reilly Auto Parts 300 - Qualifying

FORT WORTH, TX - APRIL 10: Austin Dillon, driver of the #33 Ruud Chevrolet, left, and brother Ty Dillon, driver of the #3 Bulwark/Wayne Workwear Chevrolet, pose on the grid prior to qualifying for the NASCAR XFINITY Series O’Reilly Auto Parts 300 at Texas Motor Speedway on April 10, 2015 in Fort Worth, Texas. (Photo by Sarah Glenn/Getty Images for Texas Motor Speedway)

Sarah Glenn

JOLIET, Ill. – The Dillon brothers were in full standby mode Friday at Chicagoland Speedway.

Ty Dillon will be practicing the No. 7 Chevrolet in Sprint Cup practice Friday for Regan Smith, who was returning to North Carolina because his wife was on the verge of giving birth to their second child.

With rain scrubbing qualifying and an earlier practice, Smith’s No. 7 Chevrolet of Tommy Baldwin Racing was slated to start 33rd Sunday.

In Xfinity Series practice on the 1.5-mile oval, Austin Dillon substituted in the No. 62 Chevy for Richard Childress Racing teammate Brendan Gaughan, who was ill. He was 17th fastest in the final session.

It was unclear if either of the Dillons would be needed as substitutes beyond Friday.