| http://www.w3.org/ns/prov#value | - Leading tennis players, including Roger Federer and Andy Murray, have called for more out-of-competition and blood testing.``The players have been clear that they support increased investment in anti-doping and we feel that this is the most effective way to show the world that tennis is a clean sport,'' ATP President Brad Drewett said.Tennis has been criticized for a lack of rigorous testing, part
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