Novak Djokovic recently queried the declining number of blood tests he had undergone . Rafael Nadal wants stricter drug controls in tennis . The Spaniard has been banned from the sport for two years after testing positive for a stimulant at Wimbledon last year. ITF has introduced a biological passport program to battle the problem . Czech tennis player banned for six months after positive test for sibutramine .
Rafael Nadal wants stricter drug controls in tennis . The Spaniard has been banned from the sport for two years after testing positive for a stimulant at Wimbledon last year. ITF has introduced a biological passport program to battle the problem . Czech tennis player banned for six months after positive test for sibutramine .