Louis Oosthuizen leads the field after the third round of the Shell Houston Open, at Redstone G.C. at Humble in Texas. Louis had -6 under par round of 66, to leave him at the top of the leaderboard on -17 under for the tournament. He said he was ready for the contest tomorrow in the final round; "It's a great leaderboard behind me, it's going to be tough, but I feel like I'm ready for it." Sullivan/Getty Images Two shots back at -15 under par is Hunter Mahan, who had a -7 under par third round, and is alone in second place on -15 under par. Hunter commented on only having one bogey all week; " Been playing real solid all week. One bogey so far. That's always good. This course is ; conditions are great, scoring is good. It's always in perfect shape. So , the rough is pretty short, so you can kind of ; if you avoid the water and hit it on the opposite side of the fairway or rough, you're going to have a shot at the green, and play smart like that, you can have a lot of looks, and been rolling it well this week and especially today. It's difficult out there because our mind always wants to shoot forward and go to 18 and see what kind of round you can get in and look at the leader board and try to figure all these numbers in your head. "But the more I can stay in the moment, just try hit the next shot good, it's one of those things where you just realize, oh, my gosh I'm 6, 7-under, I didn't even think about it. I'm just trying to hit the next shot good.'' Carl Pettersson and Brian Davis are still hanging around, at just three shots back on -14, and maybe still have a chance of winning the trophy. Phil Mickelson is six shots back of the lead, but is still upbeat about his chances and is excited about the coming shootout on Sunday. He said in interview; "I'm so close to playing great. I know I need to shoot a really low round out here, but I know it's there. I know that I can do it. I've done it. But I know that with the conditions right now, you can shoot 6, 7, 8, 9 under par, and hopefully that's what I'm going to be shooting for tomorrow. Instead of getting frustrated, I came in contact and hit more good shots, I gave myself good opportunities. I'm really pleased the way I played the first three rounds. Hopefully I can get a really hot round tomorrow. I'm pleased with how I played, but I'm disappointed in the score. I need to go a little bit lower. I feel like I'm playing well to where I can get a really hot round out here. I did it last year, and I thought I'm even playing better to where if I get off to a good start or make a few putts, I feel like I can really get it going tomorrow.''