Roger Federer says he has seen "improvement and no setbacks" since returning to the Tour in March after over a year out due to two knee operations and with his grasscourt season kicking off in Halle next week, it's "go time".

Tennis: It's 'go time' for Federer, 39, with favoured grasscourt season about to begin

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Tennis: It's 'go time' for Federer, 39, with favoured grasscourt season about to begin