PITTSFIELD -- While the other frontrunners struggled, defending champion Andy Congdon produced a steady 1-under 71 Saturday to take a one-shot lead after two rounds of the Berkshire Hills Singles at Berkshire Hills Country Club.

Congdon, a member of the Wyantenuck Country Club and the reigning South Carolina Senior Amateur champion, is at 4-under 140 heading into today's final round.

First-round leader Jim Mueller had an up-and-down day, finishing with a 3-over 75 that included six bogeys, a double bogey and five birdies. The Altamont, N.Y., resident is alone in second place.

Northampton Country Club's Dennis Yarrows, second after an opening-round 69, is tied for third with Wahconah Country Club's Paul Briggs. Yarrows (77) and Briggs (74) are at 1-over 145, five shots behind Congdon.

Congdon, who is seeking his fifth Berkshire Hills Singles title, had three bogeys and one birdie for a 2-over 37 on the front nine before getting on a roll with birdies on Nos. 10 and 11 on his way to a 3-under 34 on the back. He birdied all three par 5s on the final nine while making a single bogey on the par-3 13th.

Mueller, who had only one bogey in the first round, found trouble off the first tee to make a bogey right out of the gate. After a 3-over 38 on the front, he found an unconventional way to play the back in even par and keep himself within a shot of Congdon, mixing four birdies with two bogeys, one double bogey and two pars.

The leaders will tee off between 1:30 and 2 p.m. today.