Roberto Castro kept pouring in birdies and expanding his lead in the BMW Championship until he finished with another 7-under 65 and led by as many as five shots as the other players at Crooked Stick were finishing their rounds. By the end of the day, U.S. Open champion Dustin Johnson had set the course record at 63 and was tied for the lead. If he had never won in 125 starts on the PGA Tour, had a big cushion when he finished Friday, and then saw someone like Johnson charging into the share of the lead, would he be nervous. More...