Singh (right) leads Leonard by a shot. (Getty Images)

Darren Clarke ended his 36th birthday on Saturday needing one of the rounds of his life to become Ireland's first winner of a major title since Fred Daly in 1947.

And part of the reason for that was a return of the dreaded shank.

Clarke is joint third, but four strokes behind Vijay Singh with 18 holes to go in the United States PGA Championship at Whistling Straits in Wisconsin.

And he might have had some trouble sleeping after sending his tee shot to the short 17th some 70 yards right of the green.

"It was outrageous - as good a shank as you are likely to see," he said.

The Ryder Cup star was just two off the lead at the time and while he had to laugh about the incident - as he did eventually about aiming at the wrong television tower as he took a double bogey seven in the second round - it also brought back some horrid memories.

Clarke was lying second in the 1997 Open when something similar happened on the second hole of the final round, he had another en route to missing the cut in the Scottish Open last month and then a week later, on the Open's return to Troon, he shanked a chip almost at right angles.

He got out of the hole this time with a bogey four, but a level-par 72 was not what the doctor ordered after he went into the third round just one off the pace.

Singh, seeking his third major title and second PGA crown, shot 69 to reach 12 under par and is one ahead of Justin Leonard after the American, the man who pushed Clarke into second place at Troon seven years ago, failed to get up and down from sand on the last.

Alongside Clarke is Ernie Els, still in with a chance of ending Tiger Woods' five-reign reign as world number one, Masters champion Phil Mickelson after a joint best-of-the-day 67, fellow American Chris Riley and Trinidad-born Stephen Ames.

Brian Davis re-ignited his Ryder Cup hopes with a 69 for six under and a tie for ninth, but fellow Englishman Luke Donald bogeyed the last two holes to drop back alongside Padraig Harrington on five under.

Australian Stuart Appleby held the clubhouse lead earlier on at five under, but his par five on the 16th was changed to a quadruple bogey nine after he was questioned about playing out of sand after a wild drive.

The 33-year-old thought that where he was he was able to move a piece of loose grass and ground his club, but he could not and each act cost him two strokes.

It was not the only nine of the day. Colin Montgomerie had one on the long fifth en route to a 78 that put him out of the race for the title and also damaged his hopes of climbing Europe's Ryder Cup table.

With Bernhard Langer then saying he had not made up his mind on his two wild cards yet that was bad news indeed for the Scot.

Montgomerie drove into water, put his next in a bunker, then found rough and compounded it all by three-putting.

It led to the 40-year-old finishing seven over par and close to last of the 73 players who had survived the halfway cut.

Montgomerie is favourite for a Ryder Cup pick from his former partner Langer, but the German said: "There are a lot of the guys playing well and I would much rather have that than nobody.

"The bad thing is that I am going to have some disappointed ones who do not make it, but it is the same race for everybody - they all had 12 months to qualify.

"If you are not in the top 10 there are no guarantees. All I can tell you is that I have not made up my mind."

Montgomerie has to climb from 21st to 10th in the standings to be an automatic selection and there are only two more counting events to come.

On his nine he commented: "It knocked the wind out of me - it really hurt. I hit the drive 15 yards right of where I was aiming.

"One bad shot and there has to be a lake in the way. It is amazing. But never mind, I will try again in the next round.

"There is nothing wrong with my game. A couple of shots get away here and you run up a high number."

Langer was certainly right about several cup candidates playing well, but several were not able to put the finishing touches to their day's work.

Davis bogeyed the last, Donald the last two and Paul McGinley, after turning in 32 and reaching six under, fell back to three under.

Harrington did play the last six in three under, but he had earlier had a seven on the fifth and six at the 618-yard 12th.

David Howell, currently eighth in the cup race, bogeyed the last for a 70 playing with Langer and with a round to play stood two under, while one further back was Ian Poulter, ninth in the standings, but like Howell currently not in the field for next week's NEC World Championship in Akron.

Poulter also shot 70, but was looking for better than that. The Milton Keynes golfer is 61st on the world rankings and reckons he needs a top 10 finish to climb into the top 50 and therefore qualify for Firestone.

"I probably need six under in the final round now," commented Poulter. "But I am not going to hang around for the last man to finish - I am booked on a flight home and hopefully I will get off the other end and come all the way back.

"That is not a problem. I sleep very well in first-class!"

Woods, having birdied two of his last three holes in the second round to make the cut, resumed with three more in the first five.

Joint 104th after his opening 75, he climbed all the way to 14th. The world number one did bogey the seventh, but pitched to five feet two holes later and then had his fifth birdie of the day on the long 11th.

A second bogey did follow on the next, though, and after a second successive 69 for three under he knew he was dependent on the leaders falling back to have a chance.

Collated 3rd rd scores and totals:

204 Vijay Singh (Fij) 67 68 69

205 Justin Leonard 66 69 70

208 Phil Mickelson 69 72 67, Chris Riley 69 70 69, Stephen Ames (Can) 68 71 69, Darren Clarke (Gbr) 65 71 72, Ernie Els (Rsa) 66 70 72

209 Chris DiMarco 68 70 71

210 Brian Davis (Gbr) 70 71 67, Loren Roberts 68 72 70

211 Matt Gogel 71 71 69, Adam Scott (Aus) 71 71 69, Duffy Waldorf 69 72 70, Luke Donald (Gbr) 67 73 71, Jay Haas 68 72 71, Padraig Harrington (Irl) 68 71 72, Briny Baird 67 69 75

212 Steve Flesch 73 72 67, Nick O'Hern (Aus) 73 71 68, Brad Faxon 71 71 70, Rod Pampling (Aus) 73 69 70, Fredrik Jacobson (Swe) 72 70 70, Geoff Ogilvy (Aus) 68 73 71, KJ Choi (Kor) 68 71 73

213 Tiger Woods 75 69 69, Michael Campbell (Nzl) 71 73 69, Ben Crane 70 74 69, David Toms 72 72 69, Joe Ogilvie 75 68 70, Stewart Cink 73 70 70, Paul McGinley (Irl) 69 74 70, Jean-Francois Remesy (Fra) 72 71 70, Charles Howell 70 71 72, Robert Allenby (Aus) 71 70 72

214 Zach Johnson 75 70 69, David Howell (Gbr) 72 72 70, Arron Oberholser 73 71 70, Hidemichi Tanaka (Jpn) 72 71 71, Chad Campbell 73 70 71, JL Lewis 73 69 72

215 Ian Poulter (Gbr) 73 72 70, Eduardo Romero (Arg) 72 73 70, Bo Van Pelt 74 71 70, Shaun Micheel 77 68 70, Stuart Appleby (Aus) 68 75 72, Bob Tway 71 70 74

216 Tom Byrum 72 73 71, Craig Parry (Aus) 70 75 71, Trevor Immelman (Rsa) 75 69 72, Carlos Franco (Par) 69 75 72, Brett Quigley 74 69 73, Chip Sullivan 72 71 73, Nick Faldo (Gbr) 72 70 74, Miguel Angel Jimenez (Spa) 76 65 75, Pat Sheehan 70 71 75

217 Niclas Fasth (Swe) 74 70 73, Tommy Armour 72 71 74

218 SK Ho (Kor) 72 73 73, Carl Pettersson (Swe) 71 71 76

219 Woody Austin 74 71 74, Paul Azinger 74 71 74, Bernhard Langer (Ger) 74 70 75, Scott Drummond (Gbr) 71 72 76

220 Roy Biancalana 73 72 75, Todd Hamilton 72 73 75, Shingo Katayama (Jpn) 74 70 76, Scott Verplank 67 76 77, Mark Hensby (Aus) 74 69 77

221 Robert Gamez 72 73 76

223 Colin Montgomerie (Gbr) 73 72 78, Jeff Sluman 72 72 79

224 Skip Kendall 72 73 79, Jeff Coston 77 68 79