"It's burnt," Montgomerie said. "It's desperate for water. I couldn't believe when I saw that green. I've never seen it this dry.
"They should be hosing it now."
Hedblom, birdied holes No. 8-12 and made several putts from 3m to 6m. He holed one from off the green from 7.5m for birdie at the 17th. He's seeking his first victory since the 1996 Moroccan Open, which was his only win. He's also lost in two playoffs, both in 2003.
McGinley just missed the course record of 63, which has been recorded three times. The Irishman missed a 2.7m putt on the final hole that would have tied the record.
"If there was ever a comfortable 64, that was it," McGinley said. "I hit every green in regulation apart from the first, where I missed by about two inches and a couple par-5s which I reached in two.
"I played Wentworth the way it should be played -- course management, strategy, good shot-making, knowing what pins to go for and what pin to hit away from," said the 38-year-old Dubliner, who lives down the road from the course.
Curtis parred the first 10 holes and birdied the 11th. But he could only par the long 12th where others were picking up shots.
"I drove the ball better than yesterday, but I hope I'll play a little better tomorrow than I did today," Curtis said. "I didn't putt particularly well."
Hometown favorite Choi Sang-ho finished with an even-par 72 yesterday to hold on to a three-stroke lead heading into the final round.
Choi held a three-day total of eight-under-par 208 after staving off a charge by Thailand's Thaworn Wiratchant, who shot a three-under 69 at the Nam Seoul Country Club course to stay in contention three strokes back.
Edward Loar of the US also shot a 69 to lie a four strokes off the lead, alongside South Korea's Sung Si-woo.
Choi, who has led since the opening round, made three birdies on the front nine, but faltered coming in, double bogeying the 10th and bogeying two more holes against just one more birdie.
Thaworn, known for his unorthodox swing, could take over from fellow Thai Thongchai Jaidee at the top of the Asian Tour Order of Merit with a strong showing in Seoul.
Thaworn carded five birdies but joined Choi in double bogeying the par-three sixth hole.
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