Is the PGA Tour on the verge of unveiling another young stallion? A couple of years ago the names were Vaughn Taylor, Zach Johnson and Lucas Glover. Last year, Anthony Kim and Camilo Villegas stole headlines. On Sunday at Pebble Beach, 24-year-old Dustin Johnson can take his place among the young studs with his second PGA Tour victory in just over four months. Johnson will take a four-shot lead over Mike Weir to Pebble's first tee on Sunday, and he appears completely undaunted by the task. I'll be watching to see how he handles everything that Pebble will throw at him - wind, rain, long waits on tee boxes, celebrity amateurs - in pursuit of his second title. He's handled the pressure just fine so far. Johnson crushes the ball off the tee - a huge advantage on wet golf courses with little roll - and he has shown a deft touch around the greens. Asked about his nerves, he said he'd sleep just fine Saturday night. Out of habit, I'll also be checking out Phil Mickelson, who made the cut on the number but hit another tee shot out of bounds on the way to a triple bogey. Finally, I'll be watching the sky for signs of weather. After three rounds of sunshine and partly cloudy skies, heavy showers and high winds are predicted for Sunday. Things could get ugly. If they do, Weir and his all-weather game might be enough to chase down Johnson.