Jimmy Walker opened a four-stroke lead over fellow Texan Jordan Spieth, shooting a 3-under 69 on Saturday in his hometown Texas Open in San Antonio.

Walker, who lives 35 minutes away from TPC San Antonio, is looking for his fifth title in two tour seasons. He had a 9-under 207 total after opening with rounds of 71 and 67.

"It's a tough golf course," said Walker, the winner of the Sony Open in Hawaii in January. "I thought coming into today that even par or maybe 1 under would be a good score. You definitely want to find a way to extend the lead, but you have to be smart about it."

Spieth shot a 71. The 21-year-old Dallas product, coming off a playoff victory two weeks ago at Innisbrook, had a double bogey, two bogeys and two birdies on the final six holes.

"It's not ideal — I really look for more consistency," Spieth said.

FedEx Cup champion Billy Horschel birdied the final three holes for a 69 to get to 3 under.

Five players were seven back of Walker at 2 under. Zach Johnson birdied the last two holes for a 72, Chesson Hadley had a 71, tour rookie Scott Pinckney shot 69, 2011 champion Brendan Steele had a 72, and Jason Kokrak finished with a 71.

Phil Mickelson was even par after a 74. He had a near double eagle on the 14th hole.

Lehman contending

Kevin Sutherland birdied three of the final six holes for a 5-under 67 and the second-round lead over Minnesotan Tom Lehman in the Champions Tour's Mississippi Gulf Resort Classic in Saucier. Sutherland led by two strokes over 2011 MGRC champ Tom Lehman, who shot a bogey-free 66, highlighted by a 50-foot birdie putt on the par-3 eighth hole.

"It looked perfect from the beginning," he said. "It was one of those long putts that at worst case is going to be really close."