There can be a huge shift after an Olympic Games with many leading swimmers retiring. Michael Phelps will be particularly missed at the World Championships because he excelled in so many events... The United States will still dominate but it will be fascinating to see how Germany and especially Australia respond to very poor Olympics performances last summer.
Apparently some badminton doubles players have been throwing matches so that they could finish in their desired place within the chosen group. Two pairs played against each other trying to lose with no subtlety whatsoever, taking it in turns to serve in to the net several times. The Badminton Federation consequently disqualified offending teams and players.