Charlie Wi carded a three-under 69 on Friday at Pebble Beach to take a three-stroke lead after two rounds of the Pebble Beach National Pro-Am.
Wi, who was one of three first-round leaders, finished 36 holes at 12-under- par 130. Having played Monterey Peninsula and Pebble Beach in the first two rounds, Wi will move to Spyglass Hill for round three.
With the pro-am format, the entire field rotates through the three courses for the first three days, then will shift to Pebble Beach for the final round.
Two-time winner Dustin Johnson, who shared the first-round lead with Wi and Danny Lee, managed an even-par 72 at Spyglass to fall into second place at minus-nine.
Vijay Singh, the 2004 champion, posted his second straight four-under 68 on Friday to move into a tie for third place at minus-eight. He was joined there by Padraig Harrington (66), Lee (73), Brian Gay (65) and Brendon Todd (69).
Tiger Woods, who is playing this event for the first time since 2002, managed a two-under 70 at Monterey to finish two rounds at minus-six. He is tied for 17th with Ryan Moore, Ricky Barnes and two others.