HUMBLE, Texas -- Hunter Mahan is on a roll. And that stretches beyond the 173 feet of putts he made in Saturday’s third round of the Shell Houston Open. The 29-year-old Texas resident has just one finish outside the top 25 in six starts this season and, at 15 under, he enters Sunday’s final round just two shots behind leader Louis Oosthuizen. Mahan shot a 7-under 65 -- his best round of the 27 he’s played at this event – Saturday. A long bunker shot for a tap-in par on No. 4 got him started, then he made five putts from outside 10 feet on his next 10 holes. “That was a nice, easy birdie,” Mahan said of the fourth hole. “Then I made, I don't even know, 20-plus footer for par on the next hole and another 20-footer after that and played the next hole, 7 and made a birdie. That was a nice stretch there.” The two putts were 23- and 34-footers. He also rolled home putts from 14 feet (No. 7), 27 feet (No. 10) and 28 feet (No. 14) to go along with a 9-foot, 11-inch birdie roll on No. 11. Mahan was so “in the zone” that he had no idea how strong his round was until it was almost over. “I didn't know how many under I was until 15 or 16 because I was just in the round,” he said. “I was just playing golf. I was just trying to hit the next shot as good as I could and trying to stay in the moment as best I can, you know.” Mahan won the World Golf Championships-Accenture Match Play Championship in February and a victory Sunday would make him the TOUR’s first two-time winner of the season. While his game isn’t clicking like it was at Dove Mountain, Mahan says that he’s not far off that pace. “I feel good about how -- what I'm doing and how I'm playing,” he said. “I feel like I can hit almost -- I can get up and down if I miss a shot or I just feel pretty comfortable on the golf course where nothing is going to bother me too much. That's important.” CLICK HERE to replay Mahan's third round on Shot Tracker.