Robinson clinched a time of 27.49 seconds in a time trial at the US National Swimming Championships on Thursday.

The old record for the one-lap sprint was 27.61 set five years ago by Alex Dzhaburiya of Ukraine.

A day before Ed Moses set a new world record in the 100m breaststroke.

Moses, an Olympic silver medallist, broke the old record in the final of national championships.

The 20-year-old's winning time of one minute 00.29 seconds eclipsed the world record of 1:00.36 set by Russia's Roman Sloudnov last year.

It also broke Moses's own American record of 1:00.44 set at last year's Olympic trials.

"I came close this morning and tonight I felt really smooth. I knew I was close," added Moses, who will receive a $25,000 bonus for his record from USA Swimming.

"Getting the record was a monkey off my back. Now I can go for the one-minute barrier."

Moses was even with Stanford's Anthony Robinson at 28.47 seconds after 50m but he pulled away coming home.