* Danes extend lead by one stroke * U.S. second ahead of China in third (Adds quotes) MELBOURNE, Nov 26 (Reuters) - Soren Kjeldsen and Thorbjorn Olesen remained on course to claim a first World Cup of Golf for Denmark after shooting a two-under-par 70 in Saturday's foursomes to extend their overnight lead to four strokes. It's a four shot lead, which is really nice, but it's not going to be easy." Americans Rickie Fowler and Jimmy Walker were second after a 69 in the alternate shot format moved them to 10-under, a shot better than China's Wu Anshun and Li Haotong, who made a double bogey-bogey start but recovered for a round of par 72. Kjeldsen got the ball onto the green with a fine recovery shot but the pair three-putted for a bogey to take a little bit of the shine off their day. More...