Stuart Appleby has maintained his good form at the AT&T National tournament at Congressional to be joint leader alongside South Korean K.J. Choi after the second round. After being one of five joint leaders at the end of the first day, Appleby followed his first round 66 with a three-under-67 in the second to be joint leader at seven-under overall. Appleby looked set for a superb score as he opened his round with three birdies on the front nine, but the Australian could not maintain the good start coming home as he carded one birdie and a bogey on the back nine. Choi, one of the leaders after the first round as well, enjoyed a similar round to Appleby and certainly had his chances to take the lead. The South Korean recorded four birdies going out and would have led in his own right but for a bogey on the 17th, which put him on level pegging with Appleby. The two leaders have already opened up a three-stroke gap over their nearest challengers in Craig Kanada (67), Robert Garrigus (67) and Billy Andrade (68). Tournament host Tiger Woods also looks back in the hunt as he upped his game, carding a four-under-66 on the second day after recording 73 on day one. Aside from Appleby it has not been a great tournament for the Australian contingent so far. Rod Pampling is the next best Aussie at even-par after carding his second consecutive 70 while Robert Allenby (71) is one shot further back. Alllenby was in danger of missing the cut as he recorded four bogeys and two birdies going out but he pulled a stroke back coming home to be among Australia&aposs best-placed contenders. Just behind Allenby is Mathew Goggin (69), who enjoyed a significantly better second round than his first and Stephen Leaney (71), while Adam Scott (76) has missed the cut despite being familiar with the course after coming second here in 2005. Results from round two of the AT&T National : -7: K.J. Choi 66 67, Stuart Appleby (Australia) 66 67 -4: Craig Kanada 69 67, Robert Garrigus 69 67, Billy Andrade 68 68 -3: Steve Stricker 67 70, Vijay Singh 66 71, Fredrik Jacobson 68 69 -2: Jesper Parnevik 70 68, Justin Rose 69 69, Mike Weir 72 66 -1: Brian Davis 69 70, Cliff Kresge 69 70, Jerry Kelly 71 68, Tiger Woods 73 66, Kevin Stadler 69 70, Todd Hamilton 69 70 also: E: Rod Pampling (Australia) (70 70) +1: Robert Allenby (Australia) 70 71 +2: Mathew Goggin (Australia) 73 69, Stephen Leaney (Australia) 71 71 +3: Aaron Baddeley (Australia) 74 69 +4: Geoff Ogilvy (Australia) 69 75, Peter Lonard (Australia) 75 69, John Senden (Australia) 70 74 missed cut: +7: Mark Hensby (Australia) 74 73 +8: Andrew Buckle (Australia) 70 78, Adam Scott (Australia) 72 76 +12: Nick O&aposHern (Australia) 75 77