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Fort Worth, Texas — Masters champion Jordan Spieth got his homecoming off to a leading start with a birdie before dark.

Spieth made a 20-foot putt from just off the fringe on the final hole for a 6-under 64 and a share of the first-round lead Thursday in the rain-delayed Colonial.

"I had a few of those on the back nine, a few good looks where I knew what the putt was doing, I just didn't match the line and speed right," Spieth said. "I was getting a little frustrated through 17 there. I was like, just one more look. … I didn't really count (18) as a look, but maybe more like luck, and we'll take it."

The closing birdie, just after 8 p.m., tied Spieth with Kevin Na, Boo Weekley and Ryo Ishikawa.

There was a huge roar at No. 1 when Spieth teed off in the first of consecutive events at home in North Texas since becoming a major champion. The Dallas player's approach at No. 18 landed just off the back right edge of the green, which was surrounded by family, friends and plenty of fans.

"I was a little frustrated to see where my ball went, but I still was able to soak in kind of the welcoming to the 18th green," he said. "I'm sure it will continue to grow."

Spieth opened his bogey-free round with a 25-foot birdie putt at No. 1, then started the back nine with a 22-footer at No. 10. He had a great chance for another birdie on the par-3 16th, but a tricky 4-foot try slid by the hole.

Ishikawa, the 23-year-old from Japan, and 2013 Colonial champion Weekley also were without a bogey.

Na, whose only bogey came at No. 18 to close his first nine, curled up in a corner of the locker room and took a nap when tee times for the morning groups like his were pushed back three hours after more than an inch of rain fell overnight at Hogan's Alley.

"Pulled off a little veteran move, took about an hour nap," said Na, who grabbed a few extra towels, making one into a pillow, using another for a blanket and throwing another over his head. "So I felt great when I woke up."

Na originally woke up at 5 a.m. for a scheduled 7:22 a.m. tee time.

The afternoon groups started 2 hours, 40 minutes later than scheduled, but all 122 players managed to finish before dark.

George McNeill and Ian Poulter, who shared the lead before his only bogey at No. 18, were a shot back after shooting 65.

A group of nine players carded 66s on a day when players were able to lift, clean and place their golf balls hit in the fairways.

"We couldn't have had better scoring conditions today. Just the wind died down, and you could just throw darts, and they were landing and stopping," Spieth said. "I'd like to play golf in this weather the rest of my life."

After the rain, it was unseasonably cool with temperatures only in the mid-60s. The forecast is for warmer temperatures but more rain through the weekend.

Defending champion Adam Scott had a 72 that included three bogeys and a double bogey. He is No. 11 in the world and hasn't won since Colonial last year in his first week after becoming the top-ranked player.

Weekley, whose last PGA Tour win was at Colonial, woke up with a stiff back Wednesday that was still bothering him when he finally teed off Thursday.

"We just tried to manage it knowing that we couldn't hit the full shots, so we went down a club and felt like we just punched it around the golf course," he said. "And I made some putts. Made a lot of putts, actually."

His 27 putts were a collective distance of 151 feet, 9 inches, Weekley's fourth-best putting round on the PGA Tour. He made all 12 of his putts from inside 10 feet, but called a 15-foot par-saver at the par-3 13th one of the key moments in his round.

"I kind of chili-whomped it out there to the right side of the green," he said. "Nine times out of 10 that balls goes in the water, but somehow it hung up and I hit a bad chip there."

McIlroy well back

Top-ranked Rory McIlroy shot a 1-under 71, leaving the defending champion six strokes behind leader Francesco Molinari in the BMW PGA Championship in Virginia Water, England.

Playing for the fourth straight week, McIlroy had four birdies and three bogeys on Wentworth's West Course. He has won two of his last three events, taking the Match Play Championship in San Francisco on May 3 and the Wells Fargo Championship last week in North Carolina.

Molinari opened with a 65. The Italian has three top-10 finishes in the last three years at the European Tour's flagship event and tied for second last week in the Spanish Open.

Sweden's Robert Karlsson was second after a 67. Spain's Miguel Angel Jimenez was at 68 along with countryman Jorge Campillo, England's Chris Wood, South Korea's Y.E. Yang and Scotland's Marc Warren.

Kuramato leads Seniors

Massy Kuramoto had the only under-par round with a 1-under 71 to take the first-round lead in the Senior PGA Championship in cool, damp conditions on the testy Pete Dye Course at French Lick (Ind.) Resort.

The 59-year-old Kuramoto, a 30-time winner on the Japan Tour, is the chairman of the PGA of Japan and plays on the side, something he does well enough to have won the 2014 Japan Senior Open.

Kuramoto had a one-stroke lead over defending champion Colin Montgomerie, Billy Andrade, Barry Lane, Jean Francois Remesy and Bart Bryant.

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