KJ Choi took advantage of Stuart Appleby's generosity to claim the AT&T National at the Congressional Country Club.

Appleby took a two-shot lead over Choi into the final round but shot a six-over-par 76 to open the door for the South Korean, who took full advantage with a 68 to clinch his second title of the season ahead of Steve Stricker.

The 37-year-old finished on nine under par, three strokes ahead of Stricker, to add the AT&T National to the Memorial Tournament title he captured on June 3.

Choi carded two birdies on his first eight holes to reach nine under and then overcame bogeys on the 10th, 11th and 13th with birdies at the 12th, 15th and 17th.

Stricker was three under par on the front nine before bogeys on the 11th, 14th and 15th effectively ended his chances as he ended six under par.

Things started to go downhill for Appleby with a double-bogey at the second.

He then stumbled to four consecutive bogeys from the fourth onwards before carding his first birdie of the round at the eighth.

The Australian eventually finished in a tie for third with Jim Furyk and Pat Perez at three under par.

Tournament host Tiger Woods, who was playing in his first event since the birth of his daughter on June 18, tied for sixth with Robert Allenby after finishing two under par.

Choi admitted the victory was the biggest of his career.

He said: "This tournament is just too big for me to really absorb right now.

"But it's a very big win for me and definitely the biggest win of my career.

"I'm just shocked at myself being able to win Jack (Nicklaus - Memorial host) and Tiger's tournament.

"You know, I can't really express in words what this means to me. All I can say is I just did my best.

"Both wins are very special to me. I mean, I can't really say which one makes me feel better. They are both valuable.

"One thing I can say is Tiger's trophy is a lot heavier than Jack's trophy, if that means anything."

Stricker finished runner-up once again after losing out to Woods at the Wachovia Championship, although he was philosophical about the fact.

"There have been a couple of guys that have just played better," he said.

"It could have been the other way just as easy, I suppose. But the two guys that won, Tiger and KJ, they played well.

"And you know, it's just up to me, and that's the way I always looked at it; that it's up to me to make the putt, make the birdies or finish it off coming down the stretch and I just haven't done it."

Appleby got off to a horrendous start with a double bogey at the second before four bogeys in a row from the fourth onwards ruined his hopes of victory.

Furyk felt in the end, he just came up short.

"I showed a lot of good signs out there and if I had knocked in a couple of putts on the back nine, and got some momentum going, I really could have probably come close to scaring the leaders," he said.

"But as it was, I didn't."

Woods, playing in his first tournament since the birth of his daughter on June 18, tied for sixth with Robert Allenby after finishing two under par.

"I didn't get a 'W' (win) so that was frustrating in that sense," Woods said.

"But this tournament in general has been a bigger success than anyone could have imagined."

Collated fourth round scores and totals (USA unless stated, par 70):

271 KJ Choi (Kor) 66 67 70 68

274 Steve Stricker 67 70 67 70

277 Pat Perez 71 70 69 67, Jim Furyk 66 74 68 69, Stuart Appleby (Aus) 66 67 68 76

278 Tiger Woods 73 66 69 70, Robert Allenby (Aus) 70 71 69 68

279 Hunter Mahan 70 74 70 65, Mike Weir (Can) 72 66 67 74, Brandt Snedeker 69 72 70 68, Rocco Mediate 75 68 70 66

280 Vijay Singh (Fij) 66 71 73 70, Mathew Goggin (Aus) 73 69 67 71, Lucas Glover 71 69 66 74, Jeff Quinney 67 75 69 69, Boo Weekley 70 72 67 71, Craig Kanada 69 67 74 70

Geoff Ogilvy (Aus) 69 75 68 68

281 Billy Andrade 68 68 73 72, Charley Hoffman 71 69 67 74, Rodney Pampling (Aus) 70 70 69 72, Chris Riley 70 71 70 70, Shigeki Maruyama (Jpn) 72 70 65 74, Jesper Parnevik (Swe) 70 68 73 70

282 Anthony Kim 71 69 69 73, Justin Leonard 73 70 71 68, Sean O'Hair 71 70 73 68, Corey Pavin 67 73 75 67, Ryan Moore 74 70 66 72

283 Brian Davis (Eng) 69 70 70 74, Kent Jones 71 70 70 72, Robert Garrigus 69 67 73 74, Brian Gay 71 70 69 73, Stephen Leaney (Aus) 71 71 70 71, Justin Rose (Eng) 69 69 70 75, Bill Haas 69 72 71 71, Olin Browne 70 73 70 70, Briny Baird 70 73 68 72, D.J. Trahan 71 72 71 69

284 Kevin Stadler 69 70 69 76, Brett Quigley 72 70 70 72, Fredrik Jacobson (Swe) 68 69 76 71, Chris DiMarco 72 72 70 70, John Senden (Aus) 70 74 73 67

285 Charles Warren 68 73 68 76, Jerry Kelly 71 68 73 73, Arron Oberholser 74 68 69 74, Joe Ogilvie 66 77 72 70, Mathias Gronberg (Swe) 71 72 68 74, Cliff Kresge 69 70 70 76, Jamie Lovemark 67 74 73 71, Rich Beem 67 77 70 71, Frank Lickliter II 71 72 72 70

286 Tim Herron 71 73 72 70, Billy Mayfair 72 71 71 72, Michael Putnam 69 75 75 67, Peter Lonard (Aus) 75 69 70 72, Will MacKenzie 72 70 75 69, Notah Begay III 73 70 71 72, Craig Barlow 70 74 69 73, Bo Van Pelt 70 71 72 73

287 Chris Couch 68 72 77 70, Greg Owen (Eng) 67 74 75 71, Fred Funk 67 77 74 69, Mark Wilson 71 72 72 72

289 Jason Bohn 73 69 71 76, Tommy Armour III 70 72 74 73, Jason Gore 71 73 73 72

290 Aaron Baddeley (Aus) 74 69 68 79, Joe Durant 73 71 71 75, Ryuji Imada (Jpn) 73 71 78 68

291 Vaughn Taylor 72 68 78 73

292 Todd Hamilton 69 70 77 76

293 Brad Faxon 69 74 73 77