By eHow Sports & Fitness Editor
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For years, Janet Guthrie was the sole woman to compete in the Indy Car Racing Series. In 2007, three women (Danica Patrick, Sarah Fisher and Milka Dunno) participated in the Indy 500, which was a first. While it is extremely difficult for a woman to break into Indy Car Racing, these four women had the fortitude to make it happen.
eHow Sports & Fitness Editor