 The 22-time Grand Slam champion teamed up with Norwegian Kasper Ruud to record a 6-1-6-4 win over second-seeds Guido Andrejo and Mikael Varela on Swedish clay. And Chinese swimmers taking part at the Olympic Games in Paris will be drug tested twice as much as some other nations. Doping authorities have come under pressure in recent months after it emerged. 23 swimmers tested positive for a banned substance and were cleared to compete at the Tokyo Games.