The 21-year-old won the national 200m breaststroke title and in the process dipped under the Qualification Time Standards (QTS) of 2:11.66 for the global spectacle to be held in Kazan later this year.
Sweeney’s time of 2:11.64 was two hundredths of a second inside the required mark, which competitors have to meet in order to make the team for Russia.
“It was just complete euphoria when I looked up at the clock,” Sweeney said. “I’ve never been so excited to see a time in my life.
“I feel this is a real gateway for me now and it’s the biggest moment of my career.”