"I have always been for clean conditions (in the sport)," Rylov said in response.
Medina Spirit, the Kentucky Derby winner, finished third after a pivotal week that saw the horse test positive for banned substances.
Several top athletes' medical data appeared on a hackers' website.
Nadal wants his drug test results and blood-profile records public.
The Russian president said that sport "is only interesting when it is honest."
The World Anti-Doping Agency report also found that the London 2012 Olympics were 'sabotaged' by dirty competitors.