Lee Westwood shot a 4-under 68 in the second round of the Ballantine's Championship on Friday, bouncing back from a rough first day to stay six strokes off the pace.
Brett Rumford posted a 63 to get to 10 under, putting the Australian three strokes clear of Miguel Angel Jimenez and Soren Kjeldsen.
Westwood's opening round included a final-hole double bogey at the Blackstone Golf Club at Icheon. But the world No. 1 had a solid performance Friday, finishing with a birdie.
The Englishman, who won the Indonesian Masters last weekend, had a chance to move closer to the top but had three bogeys in his round.
Rumford had nine birdies to move into the lead at the halfway point.
''I struck a little bit of magic out there today and it's great to have these shots up your sleeve going into the weekend,'' said Rumford, who was the runner-up in last year's tournament. ''I had seven weeks off before playing in Malaysia and China the past two weeks, so I'm happy about today.''
Rain was in the forecast for the weekend, making Rumford's position even more important.
''The more shots up your sleeve the better going into the weekend - if the forecast is bad it's going to play very, very tricky,'' he said.
Kjeldsen carded a 66 to move to 7 under, while Jimenez added a 67 to his first-round 70. Welshman Rhys Davies, James Morrison of England and first-round leader Damien McGrane of Ireland were a shot back at 6 under, and American Dustin Johnson was at 5 under after a 69.
Three-time major winner Ernie Els is in danger of missing the cut after a second-round 73 left him at 2 over.
The $2.8 million tournament is co-sanctioned by the Asian tour, the European tour and the Korea PGA.
