Jim Ayello of USA TODAY Sports and the Indianapolis Star breaks down the 103rd running of the Indianapolis 500.

Janet Guthrie changed motor sports when, in 1977, she became the first woman to qualify for and compete in the Indianapolis 500 at Indianapolis Motor Speedway. And, in fact, that same year, she was also the first female driver to compete in NASCAR's Daytona 500.

Guthrie was an aerospace engineer whose interests shifted from aviation to racing. She has been racing at the top American motor sports series, and her racing career is chronicled in ESPN's new 30 for documentary, Qualified, which premieres Tuesday at 8 pm. ET on ESPN

Now, Guthrie, 81, is regarded as a trailblazer who helped people shed their skepticism about female drivers, opening the door for others like Danica Patrick, Lyn St. James and Pippa Mann – who will compete in the seventh Indy 500 on Sunday.

Guthrie's Indy 500 highlights – including her ninth-place finish in 1978 – and how The retired racer's views on feminism changed

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(Courtesy of ESPN; Estate of Bettye Lane)