Patience, a difficult commodity to come by for Tom Purtzer, is starting to pay off.

"I've had to struggle with it all my career. But I've had good patience the last couple of days," the 37-year-old veteran said Thursday after taking a share of the second-round lead in the $1.25 million Las Vegas Invitational.Purtzer birdied his last hole at the Las Vegas Country Club course to finish with a 66 and tie Billy Glasson for the lead after 36 holes of the five-day, 90-hole tournament.

Glasson, winner of the Doral Open earlier this year, shot 67 at the Desert Inn, one of three courses used for the first three days of the event, and also completed two rounds in 132, 12 under par.

"You have to consider this like the first round. You've played well, but there's still 54 holes to go," said Scott Hoch, tied with Dr. Gil Morgan at 133.

Hoch, who lost a playoff for the Masters title when he missed a two-foot putt earlier this month, shot a 64 despite missing twice from four feet at Spanish Trail.

Purtzer said patience has been particularly hard to come by in the last few weeks.

"I've been hitting the ball good for a month, and putting as bad as I can ever remember," he said.

"We're talking five-footers here. I couldn't make anything from that distance.

"It started at Augusta (in the Masters). I hit the ball the best I ever have and really struggled with the putter.

"It's pretty hard to have patience when you know that if you miss a green, you've got a 75-percent chance of making bogey.

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And at Austin, Texas, Sam Snead, a month short of his 77th birthday, suffered a back injury during Thursday's opening round of the Legends of Golf, but he continued playing and with partner Bob Goalby shot a six-under-par 64 at the 6,367-yard Onion Creek Club course.

Snead and Goalby were playing the two-man, better-ball Legendary Champions division for players over 60. Their 64 tied them for the division lead with George Bayer and Kel Nagle.