Marc Leishman celebrates his his birdie on the 17th hole at Trinity Forest Golf Club.
Marc Leishman got off to a blistering start at the AT&T Byron Nelson.
As it turned out, Walker came within a few inches of making one of the most incredible eagles ever witnessed on the PGA Tour, but he had to settle for a par and a round of 64 as his birdie putt was a shade off line.
"Matty actually said something to me coming up the last, (but) I didn't even think about a 59".
"I didn't get ahead of myself, which was good - 61, I'll take that".More news: Two weeks after Hawaii volcano eruption, residents say it's getting worse
Leishman had previously posted four scores of 62, including his opening round in last year's BMW Championship which he went on to win by five shots.
And now he leads this year after an opening 61, which contained eight birdies and two eagles, saw him card the best round of the day by a good distance.
But the day belonged to Leishman who, for just the third time in 797 career rounds on the main American tour, hit every fairway.
"That's the key around here", he said. "The fairways are generous, but if you're off them, you're in trouble", Leishman said.
Fellow Australian Adam Scott, desperate to improve his No.65 world ranking in a bid to earn automatic entry into next month's US Open, fired a four-under-par 67.More news: In Custody After Reports of Shots Fired at Trump Golf Resort
On the 315-yard par-4 fifth, Randolph had a bogey after hitting the green in 3 and two putting, moving Randolph to 1 over for the round.
Spaun, who started on the 10th, made six birdies over a stunning seven-hole stretch of his back nine to sit with Walker one clear of a pack of eight that included Mexico's Abraham Ancer and Americans Sam Saunders and Jonathan Byrd.
"I was hitting the right side of the fairways (with) good iron play and I obviously had a hot putter as well". Not surprised to see low scores.
A three-time major victor, Spieth - who was tied for 41st at The Players Championship - had three birdies and a bogey on a steady day, when Leishman sizzled.More news: India declares 'conditional ceasefire' in Occupied Kashmir during Ramazan