Charlie Wi continued to set the pace in the Pebble Beach National Pro-Am as Tiger Woods forced his way into contention with a run of five birdies in six holes.

Second round leader Wi had a bogey-free round of 69 for three under on the day at Spyglass Hill and 15 under overall to lead by three shots from American Ken Duke.

But it was the performance of Woods which attracted most attention as he ends a 10-year absence from the event but his run of birdies was followed by seven pars at the end of his round of 67 for five under which sees him four shots off the pace overall.

Wi ended the day on 15 under which saw him three ahead of Duke, with Woods a further shot back and Phil Mickelson two further back on nine under.

Mickelson shot 70 at Pebble Beach and was joined on nine under by Dustin Johnson who shot an even 70 at Monterey Peninsula.

They are joined on nine under by fellow Americans Kevin Na, Brendon Todd and Hunter Mahan, while Ireland's Padraig Harrington lies a shot further back along with home duo Bob Estes and Ricky Barnes.

A late fade by Fiji's Vijay Singh saw him join the group on seven under along with England's Greg Owen.

Gary Christian and Brian Davis both finished the day on two under, one shot ahead of fellow Englishman Ian Poulter.

Woods told the PGA Tour website: "I hit my putts as well I did the last couple of days. This time they went in.

"I've got a chance going into [Sunday]. Obviously I have to put together another good round and possibly go even lower."