This year biological passports will be introduced in tennis sport to keep tabs on players and flush out the drug cheats among them, say tennis authorities.

The scheme, which sees results are collected and combined over a period of time to enable authorities to detect changes, will mean an increase in blood and out-of-competition testing and will apply to all players in Grand Slams and events sanctioned by the ITF, Association of Tennis Professionals (ATP) and Women's Tennis Association (WTA).
Lance Armstrong has claimed the introduction of the passports was a huge step towards stopping his doping network, the report added.
Source-ANI