Scott, Chalmers still in hunt at US PGA Adam Scott and Greg Chalmers are confident they can make a serious run at the leaders in the final rounds of the US PGA tour event at Riviera Country Club. The Australians sit at four-under-par 138 after two rounds in a tie for 13th, five back from Korean Sang-Moon Bae and Swede Fredrik Jacobson, but full of belief they can climb up the leaderboard. Bae and Jacobson fired six-under 65s in round two to move to nine-under 133, one clear of American John Merrick (66) and two in front of England's world No.3 Luke Donald (66). Further big names lurk with 2011 Masters champion Charl Schwartzel (67), 2012 US Open champion Webb Simpson (66) and former No.1 Lee Westwood tied sixth at six under. "Today's round is what I needed to be in with a sniff going into the weekend," Scott said after notching five birdies and just one bogey. I am going to have to have two really good rounds but it is certainly possible. Tomorrow is an important day. You have to be careful out here with how firm it is. It's easy to run a few by the hole or short side yourself and give away easy bogeys. So I've got a feeling it will tighten up over the weekend here and I won't have to do anything miraculous. I just have to play some bogey-free stuff and be solid. Scott is playing his first event of the year, having been away from competitive golf since early December. The Queenslander headed to the range to tweak his timing in an effort to be at his best for round three. "I am happy with how sharp I've been, considering I haven't played," he said. I didn't take advantage of my good shots but I certainly made up for the poor shots with good stuff around the greens. It would be nice to drive the ball a little tighter than I have been. The rhythm out there isn't quite what I want it to be but that will come. Chalmers, who saw first hand what it took to be leading the tournament after being paired with Bae and Merrick, was also confident the firm conditions could help him better his best result at Riviera. He missed the cut in wet conditions over the previous two years and hasn't contended at the course since a tie for 13th in 2001. The conditions have helped me a lot. It's nice and dry so length isn't such a big deal and I think I'm a much better player now then I have been in the past," Chalmers said. I'm in a good spot right now so I am pleased about that and excited about tomorrow. If the greens get firmer, it wouldn't surprise me if the winning score is only one or two better than the scores at the end of today. So you have to stay patient and see if you can throw a low one in there to make guys a little nervous. The key will be making those putts of around 10 to 15 feet.