Oosthuizen on Top after 54 Holes of Houston Open

Thanks to four straight birdies on the back nine, Louis Oosthuizen surged into the lead after completing 54 holes of the $6 million Houston Open. The $6 million PGA Tour stop began Thursday on the Tournament Course at Redstone Golf Club in Humble, Texas.

After opening with two bogeys, the 29-year-old South African added three birdies on to make the turn in 1-under 35. On the back side, Oosthuizen got hot, reeling off four birdies in a row on Nos. 12-15 en route to a 6-under 66 to reach 17-under 199.

He leads American Hunter Mahan, who carded Saturday's low round, a 7-under 65, by two strokes, and Sweden's Carl Petterssen (67) and England's Brian Davis (69) by three. James Driscoll posted a 1-under 71 to go into solo fifth at 12-under 204.

Tied for sixth at 205 are defending champion Phil Mickelson (70), Ryan Palmer (66) and Keegan Bradley (69).

After rain forced cancellation of some rounds Thursday, the field has been forced to catch up the past two days. Some first rounds were finished Friday and some second rounds on Saturday morning. All the third rounds were completed Saturday to set up Sunday's 18-hole finale.

Houston resident Jeff Maggert was the leader through 36 holes, but the 48-year-old stumbled to a 4-over 76 in the afternoon to fall down the leaderboard into a tie for 14th at 8-under 208 with, among others, Ernie Els, who carded a 69.

For all the scores, visit http://www.pgatour.com/leaderboards/current/r020/.