Bradley Dredge shot 5-under 66 Friday to lead the Russian Open by one stroke at the halfway stage.
The Welshman started the day tied for third but had a bogey-free second round for 10-under 132 overall after teeing off on a damp morning at the Skolkovo Golf Club outside Moscow.
The 42-year-old Dredge is chasing his first tour win since the 2006 European Masters.
England's Lee Slattery is second after shooting 67, including five birdies on the back nine.
Daniel Gaunt of Australia, who had a share of the lead after the first round, shot 69 to drop to third at 8 under.