TOKYO: Superstar gymnast Simone Biles pulled out of a second event to protect her mental health on Wednesday, putting the spotlight on athletes’ well-being at a Tokyo Olympics held under strict rules to prevent the spread of coronavirus.Biles, who caused shockwaves with her withdrawal during the team event on Tuesday, also ditched the all-around, raising doubts about her further participation in Tokyo.The 24-year-old American’s struggles follow those of Japanese tennis star Naomi Osaka,...