Newly minted world record-holder Gretchen Walsh punched her ticket to the Paris Olympics on Sunday with a victory in the women's 100 metres butterfly in a swift time of 55.31 seconds.

The 21-year-old American couldn't match the astonishing 55.18 she threw down in the semi-finals of the US Olympic swimming trials to shatter Sweden's Sarah Sjoestroem's previous mark of 55.48 -- but she clocked the second-fastest time ever and secured a berth at the Games.

"I'm still in shock," Walsh said. "I don't even know what to say. Making the team was the biggest goal, but getting a world record was absolutely insanity."

Walsh's mark in the butterfly on Saturday was the third world record set in women's swimming over the past couple of months, coming on the back of Canadian Summer McIntosh's effort in the 400 metres individual medley and Australian star Ariarne Titmus' blistering time in the 200 metres freestyle. (AFP)