Top stars welcome biological passports

Roger Federer and Andy Murray, who have been outspoken in calling for more stringent anti-doping measures in tennis, welcomed the introduction of biological passports for players.

The International Tennis Federation announced the move in London on Thursday, after a meeting of the Tennis Anti-Doping Program working group that includes representatives from the ITF, ATP, WTA and Grand Slam tournaments.

The ITF said there was unanimous support for the introduction of the passport, which is used to detect variances in biological make-up that might indicate doping and has been introduced in cycling.