Tournament preview by Siddhartha Vaidyanathan Yuvraj Singh and Chris Gayle. Both left-handed batsmen, both handy spinners. Arriving on the international scene within a year of each other. One going on to play 304 ODIs, the other 298 (and counting). Each with an ODI average in the mid-30s. Each with a strike-rate around 87. Monster six-hitters. Now T20 freelancers. Gayle returning to the scene of his international debut (v India, in Toronto, September, 1999). Yuvraj in his first trip to Canada – though the hospitality he has received and the food…