Rudisha revving up for more history

Middle-distance great David Rudisha hopes Saturday's Diamond League meet in Shanghai is the start of a new odyssey in a glittering journey aimed at taking world gold in London this summer and a third Olympic title at Tokyo 2020.

The Kenyan made his Shanghai Diamond League debut last May, finishing fifth, but went on to retain the 800m Olympic title in Rio in some style.

Now his immediate focus is retaining the gold he won last year in Beijing when the world championships roll into London in August.