Paul Nyakazeya, Group Digital Editor 
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Twenty-time Grand Slam champion Roger Federer and British number one Johanna Konta have both pulled out of this summer’s Tokyo Olympics. Federer, 39, has suffered a setback with an existing knee injury. The Swiss legend won doubles gold at Beijing 2008 and silver in 2012, losing the singles final to Andy Murray. Konta, 30, has…
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