Javier, who finished second behind Greene at last summers World Championships in Daegu, has been the form athlete all season and won with a world-leading time of 47.78sec, but Greene will be delighted that he was able to run him so close.

It was after that race that Greene chose to go public with the news that he had undergone knee surgery in the winter and had lost a large chunk of training time during his rehabilitation.

But, after several weeks of tough training at his Bath base, he is now clearly firing on all cylinders as he sliced 0.04sec off his previous personal best and came within just 0.02sec of Kriss Akabusis 20-year-old UK record.

Christine Ohuruogu, the defending Olympic 400m champion, is also enjoying a return to form this season after several years of injuries and her time of 50.59sec was her quickest since 2009.

Her problem is that the womens 400m is one of the deepest and most competitive events in the athletics programme and there were still three runners ahead of her. The winner, Botswanas world champion Amantle Montsho, won in 49.77sec.

In the mens 5,000m, Ethiopian Dejen Gebremeskel displaced Mo Farah at the top of the world rankings with victory in a super-fast 12min 46.81sec that proved he will be a big threat in London.

Countryman Kenenisa Bekele, the Olympic champion, is in danger of not being selected for the event after finishing ninth.

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London 2012 Olympics: Dai Greene clocks personal best at perfect time in Paris Diamond League meeting