Jessica Hardy qualified for her third event at the Olympics with victory in the women's 50metres freestyle at the United States trials.
But there wasn't good news for Dara Torres as she missed out after finishing fourth as the event concluded in Omaha, Nebraska.
Breaststroke specialist Hardy was already eligible to represent Team USA in the 100m freestyle and 400m free relay before her latest victory.
Hardy won in a time of 24.50 seconds from Kara Lynn Joyce (24.73), whose second-place finish also secured her spot in London in the event.
The result ended 12-time Olympic medallist Torres' hopes of becoming the female swimmer with the most Games appearances.
The 45-year-old, who first competed at the Olympics in Los Angeles in 1984, finished fourth in 24.82secs.
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