There were 13 players within two strokes of the leading quartet. The closest chasers included
Matsuyama, the 22-year-old from Japan with five wins at home, shot a bogey-free 64 on Saturday. Toms, who got the last of his 13
Walker was six under after a 69, and Scott was another stroke back after a 66. Walker and Campbell were playing together, and were tied for the lead at eight under before both bogeyed the 161-yard 13th hole.
Play was suspended 1 hour and 8 minutes because of an approaching thunderstorm that brought only a brief downpour.
Second-round leader Brice Garnett fell back with a bogey at the 216-yard fourth hole, followed by a double bogey when he drove out of bounds at the tight fifth hole that runs parallel to the Trinity River. The PGA Tour rookie shot 74 and dropped into a tie for 25th at three under.
Matsuyama had three early birdies, including at Nos. 4 and 5 — the last two of a trio of holes known as the “Horrible Horseshoe” because of the layout of difficulty of the holes. There are two difficult par 4s with the course's longest par 3 between them.
“Kind of set the tone for the rest of the round,” Matsuyama said through an interpreter.
Colin Montgomerie took the third-round lead in the Senior
Trying to win his first major championship, the 51-year-old Scot took a seven-under 206 total into the final round at Harbor Shores.
Bernhard Langer, the 56-year-old German star who has won twice this season on the Champions Tour, was a stroke back after a 70. He will play alongside Montgomerie for the fourth consecutive round Sunday.
Marco Dawson, Bart Bryant and Kiyoshi Murota were tied for third at 5 under. Dawson had a 64, the best round of the tournament. Bryant and Murota shot 70.
Anna Nordqvist moved into position for her third victory of the year, shooting her second straight six-under 66 to take the third-round lead in the Airbus
The 26-year-old Swede, the winner in Thailand and Carlsbad, had a 16-under 200 total on The Crossings course at the Robert Trent Jones Golf Trail's Magnolia Grove complex.
Catriona Matthew, the 44-year-old Scot who led after each of the first two days, was a stroke back. She birdied three of the last four holes for a 70.
Second-ranked Stacy Lewis, the 2012 champion who needs to finish solo third or higher to take the top spot in the world from Inbee Park, was third after a 66. Park missed the cut Friday.
Michelle Wie, Jessica Korda and 18-year-old Charley Hull were tied for fourth at 13 under. Wie shot 66, Korda 69, and Hull 71.
The 43-year old Dane fought back from a double bogey on the first hole by making six straight birdies from the 11th and then adding another one at the last for a five-under 67. His 15-under total of 201 put him five shots clear of
Donald, a two-time former BMW PGA winner, birdied his closing two holes for a 68. Ireland's Shane Lowry shared the overnight lead with Bjorn but shot a 73 to sit another shot back in third.