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Murray slips down the rankings

Andy Murray is determined to be playing "good tennis" by the French Open © Getty Images

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Andy Murray has vowed to rediscover his form after dropping out of the top four in the world rankings.

The British No. 1 slumped to a second round defeat against Philipp Kohlschreiber at the Monte Carlo Masters last week, his third in as many matches. After a semi-final showing in Monaco 12 months ago, Murray dropped further rankings points to slip back to fifth.

Murray has not entered this week's Barcelona Open, instead opting to train with former clay-court specialist Alex Corretja. Murray openly admitted he was well off his best and is determined to revive his game that saw him reach the Australian Open final in January.

"I need to sort out myself now," he said. "There's stuff that goes on with tennis and things off court can affect it. You just need to make sure you keep all your problems out of it. By the French I want to be playing good tennis again."

Juan Martin del Potro moves up to fourth, despite not having played since January, while Spain's Fernando Verdasco moves back into the top ten after reaching the final in Monte Carlo.

Sam Stosur was the only mover in the women's top ten, after her second tour title at the Family Circle Cup saw her leapfrog Kim Clijsters at No. 10.

ATP World Rankings
1. Roger Federer (SUI), 2. Novak Djokovick (SRB), 3. Rafael Nadal (ESP), 4. Juan Martin Del Potro (ARG) 5. Andy Murray (GBR), 6. Nikolay Davydenko (RUS), 7. Andy Roddick (USA), 8. Robin Soderling (SWE), 9. Fernando Verdasco (ESP), 10. Jo-Wilfried Tsonga (FRA)

WTA World Rankings
1. Serena Williams (USA), 2. Caroline Wozniacki (DEN), 3. Dinara Safina (RUS), 4. Venus Williams (USA), 5. Svetlana Kuznetsova (RUS), 6. Elena Dementieva (Rus), 7. Jelena Jankovic (SRB), 8. Agnieszka Radwanska (POL), 9. Victoria Azarenka (BLR), 10. Sam Stosur (AUS)

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