Roger Federer returns a ball to Jun Martin del Potro in their Miami Open clash. Photo: TNS

Roger Federer blows past Juan Martin del Potro into Miami Open fourth round

In-form Swiss powers into fourth round of the Miami Open with a 6-3, 6-4 win over Del Potro

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Roger Federer returns a ball to Jun Martin del Potro in their Miami Open clash. Photo: TNS
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