| Lexington Challenger |
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| Event name | Lexington Open |
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| Location | Lexington, United States |
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| Venue | Hilary J. Boone Tennis Complex |
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| Surface | Hard / outdoors |
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| Website | lexingtonopen.org |
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| Category | ATP Challenger Tour |
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| Draw | 32S / 32Q / 16D |
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| Prize money | $100,000 (2025), $82,000 (2024), $50,000 |
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The Lexington Open (previously known as the Kentucky Bank Tennis Championships and the Fifth Third Bank Tennis Championships) is a professional tennis tournament played on outdoor hardcourts. It is currently part of the ATP Challenger Tour and the ITF Women's World Tennis Tour, and has been held annually at the Hilary J. Boone Tennis Complex in Lexington, Kentucky, since 1995 for men and since 1997 for women. It is the longest running active ATP Challenger Tour tournament in the US, marking its 30th edition in 2025.
In 2020, the tournament was held as a once-off WTA Tour tournament. In 2022, it returned to the ITF Circuit.