Brendan Hansen has broken his second world record in four days, swimming the 200 metres breaststroke in 2:09.04 at the U.S. Olympic trials.
On Sunday Hansen broke the old mark of 2:09.42
set by Japan's Kosuke Kitajima at last year's world championships in Barcelona.
On Thursday, the 22-year-old improved on Kitajima's 100 metre breaststroke world mark of 59.78 when he touched in 59.30 seconds.