ROTTERDAM (Reuters) - World number two Roger Federer has called for the introduction of biological passports in tennis similar to those used in cycling to detect possible doping. "A blood passport will be necessary as some substances can't be discovered right now but might in the future, and that risk of discovery can chase cheaters away," the 31-year-old Swiss said on the opening day of the World Indoor Tournament in Rotterdam. "But there also should be more blood tests and out of competition controls in tennis," he added. ...
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