Lisa Dobriskey believes she can find the form which will ensure her a place in the 1,500 metres final at next month's World Championships in Berlin.

Dobriskey, fourth in last year's Olympic final, finished a position lower in Tuesday night's Herculis Super Grand Prix meeting in Monaco, but was lifted by her performance.

She clocked a time of four minutes 02.28 seconds which raised her spirits before the championships get under way in three weeks' time.

"I am pleased for running my seasonal best in such a high-quality race," said Dobriskey, who was no match for Maryam Yusuf Yamal, the reigning world champion, who triumphed in 3mins 58.83secs.

"I really enjoyed the race - my goal is to finish in the top six in Berlin."

Behind her in eighth, Steph Twell also achieved a lifetime best of 4:03.38 while Hannah England was a place behind with her fastest-ever time of 4:04.27.

World junior champion Twell was pleased to improve on a disappointing outing in last weekend's London Grand Prix and said: "This race was much better. I am pleased with this race against a strong field. I definitely plan to reach the final in Berlin."

Mo Farah produced a massive improvement to his previous 1,500m best of 3:38.02 set three years ago, clocking 3:33.98.

Farah showed that he is peaking perfectly for the World Championships with a second convincing performance which followed his win in the 5,000 metres in London.

"I am very happy for running so fast today. I did not expect it," said the European 5,000m silver medallist, who was delighted after finishing 10th in a super-fast race won by Frenchman Mehdi Baala in 3:30.98.

Jenny Meadows finished a brilliant third in the women's 800m in the fifth fastest time ever by a Briton of 1:58.63, with Jemma Simpson a place behind her in a personal best of 1:59.07.

Martyn Rooney, who won last year in Monaco ahead of his sixth place at the Beijing Olympics, could not repeat that feat as he struggles to return to his best form after a hamstring injury.

Rooney finished seventh in 46.22, starting from the unfavourable first lane in a race which was won by Olympic champion LaShawn Merritt of the United States in 44.72.

David Greene, the fastest man in Europe this year in the men's 400m hurdles, won the 'B' race in 49.04 while long jumper Chris Tomlinson finished second with 8.11m behind South-African Khotso Mokoena who cleared 8.28.