Beachwood, OH (My Sportsbook) - Scotland's Ross Drummond carded a four-under 66 Friday to take a two-stroke lead after two rounds of the 70th Senior PGA Championship.

Drummond completed 36 holes at four-under-par 136, which is four strokes better than Tom Purtzer posted as last year's 36-hole leader at Oak Hill.

Purtzer bogeyed four of his last five holes Friday to shoot two-over 72, dropping him from a tie for the lead entering the round into a share of second place.

Purtzer was joined at two-under-par 138 by Jeff Sluman (68), Champions Tour leading money winner Bernhard Langer (70), Larry Mize (69) and fellow first- round leader Scott Hoch (72).

This is the first major championship of the 2009 campaign for the elder circuit.

Drummond got his round going with a 20-foot birdie putt at the third. However, he gave that shot right back with a bogey on the fourth at Canterbury Golf Club.

The Scotsman drained another birdie putt on the sixth and again followed with a bogey on his next hole. He parred the next two to head to the back nine at even-par for the championship.

Drummond, a regular for many years on the European Tour, started his roll to the top of the leaderboard on the 10th, where he sank an eight-foot birdie effort.

The 52-year-old made it two in a row with a six-foot birdie putt on the 11th. After missing a short birdie putt on the 12th, Drummond poured in a 40-footer for birdie on 13 to get to minus-three.

Drummond birdied the par-five 16th from just inside 15 feet to get to four- under. He still trailed, but was able to take over the lead thanks to Purtzer's late struggles.

"Well, I'm obviously delighted with the outcome," Drummond said. "I was happy with shooting 70 yesterday. I thought that was quite an achievement. My round today was a little bit up-and-down to start with. I had two birdies and two bogeys -- actually a bogey followed the birdie each time on the front nine.

"So I wasn't really making any headway. I made three birdies in the first four holes and 10, 11, and 13 and that kind of kick started things and I managed to just hold on."

Drummond's lead is surprising. He has played just three events on the European Seniors Tour this season and his best finish was a tie for seventh. This is just his second start in this event and second on the Champions Tour.

Purtzer birdied the first and second to move to six-under and he remained alone in the lead until late in the round. He bogeyed the fifth, but recovered that stroke with a birdie on the par-four eighth.

The four-time winner on the Champions Tour tripped to another bogey on the 10th. Purtzer stumbled out of the lead with bogeys on 14 and 15.

Purtzer steadied himself as he birdied No. 16 but he fell two back as he bogeyed each of his final two holes.

Sluman posted four birdies and two bogeys in his round of 68, while Langer notched three bogeys, an eagle a birdie for his 70.

Mize, the 1987 Masters champion, made three birdies and two bogeys as he posted his second straight 69. Hoch bogeyed the 11th, but bounced back with birdies on 16 and 17. Around the turn, he tripped to three bogeys to slide back to minus-two.

Tom Kite, the 2000 runner-up, managed an even-par 70 to finish two rounds at one-under-par 139. He was joined in a share of seventh place by Gil Morgan (68), Jay Don Blake (69) and Chris Starkjohann (68).

Defending champion Jay Haas is tied for 42nd at five-over-par 145 after shooting 74 in the second round.

The cut fell at seven-over-par 147 with 77 players making the final two rounds. Among those who missed the cut were Craig Stadler, 2002 champion Fuzzy Zoeller, Nick Price and Ben Crenshaw.