(Reuters) - American Luke Guthrie stuttered with two bogeys in the last three holes but retained a share of the lead with Spain's Rafael Cabrera-Bello after the third round of the BMW Masters in Shanghai on Saturday. Guthrie was four shots clear of the field halfway through his round but the late blip saw him card a 72. "At the beginning of the week, if I was tied going into the fourth round tied for the lead, I'd have taken it," the world number 85 told reporters at the Lake Malaren Golf Club. "As today went it was a little frustrating. ... More...