FORT WORTH, Texas (AP) — Zach Johnson shot a bogey-free 6-under 64 on Thursday to take a one-stroke lead after the first round of the Colonial.

Johnson opened his round with a 40-foot birdie putt on his first hole, No. 10. After blasting from a greenside bunker at No. 12 to save par, he had four birdies in a row on a day when gusty wind whipped through the big oaks lining the fairways at Hogan's Alley.

Johnson, the 2007 Masters champion, is winless since his victory in the 2010 Colonial. That year, he shot 65-66-64-64 to finish at a tournament-record 21-under 259.

Jason Dufner, the Byron Nelson Championship winner Sunday, was a stroke back along with PGA Tour rookie Harris English, Tom Gillis and Kyle Reifers.

SENIOR PGA CHAMPIONSHIP

BENTON HARBOR, Mich. (AP) — Roger Chapman shot a 3-under 68 to take the first-round lead in the Senior PGA Championship at difficult Harbor Shores.

The Englishman is playing only his second tournament of the year after tying for 16th this month in the European Senior Tour's Mallorca Open.

John Cook was a stroke back in the major championship, and Steve Pate, J.L. Lewis, Jeff Sluman, Jay Haas, David Frost and Jim Carter followed at 70.

Bernhard Langer and Mark Calcavecchia shot 73. Fred Funk, coming off a victory May 6 at The Woodlands in the last Champions Tour's event, had a 74. Fred Couples and Tom Lehman shot 76.

BMW PGA CHAMPIONSHIP

VIRGINIA WATER, England (AP) — Ireland's Peter Lawrie and Scotland's David Drysdale shared the first-round lead at 6-under 66 in the BMW PGA Championship at Wentworth.

England's Justin Rose was a stroke back along with Spain's Alvaro Quiros, Swedes Niclas Fasth and Richard S. Johnson and Wales' Jamie Donaldson in the European Tour's flagship event.

Second-ranked Luke Donald, the defending champion, topped a group at 68. Top-ranked Rory McIlroy had a 74.