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Casey Dellacqua admitted concentration was an issue in her Hobart International opener. Picture: Mark Metcalfe/Getty Images | Hobart International Tennis
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Organizational musings: Concentration, Vision, Practice: Essential for Tennis Players – and New Ventures
Australian Open - Destanee Aiava is a picture of concentration. | Facebook | Australian Open,Men's Professional Tennis,Aiava,Destanee,picture, concentration,of
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Nerves get better of China's Wang Yafan against Venus Williams at Hong Kong Open | South China Morning Post
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