Tennis is adopting the biological passport program and increasing the number of blood tests as part of a new anti-doping drive that players themselves have demanded.

Serena Williams frightened a few people, including herself. Defending champion Victoria Azarenka had a momentary lack of concentration. Two of the biggest names on the men's side at the Australian Open — Roger Federer and Andy Murray — had straight-set wins.
Brad Drewett has been diagnosed with Lou Gehrig's disease, and the ATP World Tour executive chairman and president is planning to step down once a successor is found.
The ATP says its season-ending finals will stay in London for an extra two years to 2015.
Richard Krajicek, the 1996 Wimbledon champion, is one of six members of the ATP's new competition committee, which will recommend possible changes to men's professional tennis.
The blue clay that made Rafael Nadal and Novak Djokovic feel, well, blue at last month's Madrid Open is going away.
The blue clay that made Rafael Nadal and Novak Djokovic feel, well, blue at last month's Madrid Open is going away.
The new head of men's tennis says he has heard the concerns of players "loud and clear" and plans to ensure they are addressed.
The new head of men's tennis says he has heard the concerns of players "loud and clear" and plans to ensure they are addressed.