TIRED IN TORONTO: Two men who medaled last weekend in London, Juan Martin Del Potro and Jo Tsonga, went down and looked very jetlagged. Radek Stepanek beat DelPo 6-4 7-6(5), and Jeremy Chardy took out countryman Tsonga 6-4 7-6(4). Meanwhile, gold medalist Andy Murray tweaked his left knee and still managed to best Flavio Cipolla 6-1 6-3. Next up for Murray is Canada