Djokovic and Nadal have elevated tennis idiosyncrasy to an Olympic level and sometimes have irked opponents along the way. Djokovic’s cardinal trait is the ball bounce, a psychological need that can occupy large blocks of time before he serves. Nadal has more elaborate behaviors-there will be kangaroo jumps in the locker room, ultra-precise drink bottle positioning on changeovers, obsessive toweling off between points and equally obsessive wiping of the lines between points with a sneaker sole. Sylvia Hanika, a German player in the 1980s, bounced the ball as many as 30 times before serving. Conchita Martínez used to expend plenty of time and energy securing the ball with which she had just won the previous point so she could serve it again…read article…