Gretchen Walsh sets a world record in the 100-meter butterfly at the U.S. Olympic trials

INDIANAPOLIS (AP) — Gretchen Walsh set a world record in the women's 100-meter butterfly Saturday night, posting a time of 55.18 seconds in a semifinal heat at the U.S. Olympic swimming trials.

Walsh was more than a half-second under world-record pace at the turn and held on to eclipse the mark of 55.48 set by Sweden's Sarah Sjöström at the 2016 Rio de Janeiro Olympics.

“I definitely was feeling it," said Walsh, who considers herself a stronger swimmer in the short-course pool.