Michael Phelps eased his world championships heartache with a 100m butterfly win Saturday as 16-year-old Missy "Missile" Franklin exploded onto the scene with another two gold medals in Shanghai.

Phelps, the Olympic champion and world record-holder, was third halfway through the 100m butterfly but he swept through the field to win in 50.71sec, ahead of Poland's Konrad Czerniak and America's Tyler McGill.