'Bionic' Vonn sets out on quest for global treble

(Reuters) - Lindsey Vonn opens her assault on triple gold in St Moritz on Tuesday with the great American racer threatening once again to be the most captivating figure at the world Alpine skiing championships. Currently in the middle of another unfathomable comeback, this time from a broken right arm sustained in training late last year, the under-raced Vonn cannot be ruled out from adding to her career tally of six world championship medals. Certainly I've won a lot of World Cups, world champi