Dai Greene has broken the British record for the rarely-run distance of 600m.
The world 400m hurdles champion edged out fellow Briton Andrew Osagie, who specialises in the 800m.
Greene, who finished in 1.16:22 to break a 28-year record, was pleased with his performance even though he was beaten by American Duane Solomon.
"I enjoyed running indoors for a change, and doing a 600," he said afterwards. "I was very much out of my comfort zone and enjoyed testing myself.
"I am pleased with the time and I wish I had put a bit more of a challenge in on Duane, but I think he ran a great race.
"It was nice to get the national record too."