It appears that the Grand Slam tournaments and the two tours are ready to make a bigger financial contribution to the ITF in order to increase tennis anti-doping efforts.
The ITF’s anti-doping program budget is said to be between $1.5 million to $2 million annually, which is small compared to many other sports. A number of players—including Roger Federer, Andy Murray, and Novak Djokovic—have said they would support an increase in out-of-competition blood tests, which are said to be more reliable than urine tests. In 2011, the ITF conducted only 21 out-of-competition blood tests.
The Daily Mail first reported that Wimbledon has pledged to double its contribution to the ITF, and then USA Today reported that the U.S. Open will double its contribution from about $150,000 to $300,000 a year, which is presumably the figure the other three majors will match.