COLLIS Birmingham’s has run a 5000 metres personal best as he prepares for the London Olympic Games.
Birmingham cut 0.46 seconds off his previous best at a Diamond League meeting in Eugene, Oregan, USA, Sunday morning (AEST).
The Ballarat distance runner finished ninth in 13 minutes, 10.51 seconds.
His previous best of 13:10.97 was also run at Eugene in 2010.
Britain's Mo Farah won in 12.56.98 seconds – the fastest time in the world this year.
Kenya's Isaiah Koech came second with American Galen Rupp third.
defending Olympic champion, Ethiopia's Kenenisa Bekele was fourth.
Farah won the 5000m gold medal at last year's world Craig championships.
Australia’s other competitor at Eugen, Craig Mottram finished 14th in 13:13.
Birmingham is nominated for the 5000m for the Olympics.
The Australian Olympic Committee will confirm the composition of the track and field team for London later this month.