World number two Roger Federer has welcomed the introduction of biological passports into tennis as a way of better detecting drug cheats.
The Tennis Anti-Doping Programme Working Group has announced yesterday that they will be increasing the number of blood tests taken each year in order to keep the sport clean.
When questioned on the matter, the 17-time Grand Slam champion told reporters: "That's good news. I think tennis has done a good job of trying everything to be as clean as possible but we are entering a new era.
"We just need to make sure from our side that we are doing everything we can and for that reason we need the players to engage in this process.
"We have to do everything to ensure our tour is as clean as it possibly can be."
The move has been backed by a number of tennis's high-profile stars.