Webb Simpson (eight-under), Jason Dufner (seven-under), Brandt Snedeker (five-under) and Martin Kaymer (five-under) are among the golfers within five shots of the top spot.
Now ranked 96th in the world, Donald mixed five birdies with a bogey - at the par-four 11th - in his second round.
"It was a little bit of a roller coaster but it was good to pick up a couple of eagles", Dufner told the PGA Tour website.
DeLaet, seeking his first PGA Tour victory after three second-place finishes and three thirds, vaulted up the leaderboard with a red-hot run around the turn.
"Obviously, it's a place I feel comfortable and I like and I've had a lot of success", he said.
Tway, 57, an eight-time victor on the PGA Tour who is winless on the 50-and-over circuit, birdied the par-5 sixth to reach 9 under, then dropped shots on the par-4 seventh and ninth at TPC Sugarloaf.
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Taylor, who celebrated his 29th birthday on Friday, posted a 5-under 66 to remain in contention as he bids for his second career Tour victory. But four birdies in a six-hole stretch from Nos.
LPGA: Su-Yeon Jang headed into the final round of the Lotte Championship playing bogey-free golf, finishing the third round late Friday with 7-under 65 for a three-stroke lead in Kapolei, Hawaii. He holed out for eagle from the fairway on the par-four 12th and played the opening nine in six-under 30. He then played the back nine in four-under 31.
The 39-year-old Kerr broke the tournament record at 20-under 268, a day after shooting 62 at Ko Olina to match the event mark. He has a one-shot lead over Lucas Bjerregaard and Trevor Fisher Jr.
On a day where scoring wasn't easy and no one shot lower than 70, 52 players were on level par or better and within three shots of the lead. Havret was part of a four-way tie for the lead overnight but pushed clear and could have had more of an advantage heading to the weekend if he hadn't bogeyed his last two holes. After Bryan moved in front on the 15th, he sweated out three straight two-putt pars.
Paul Dunne shot a level par 73 to lie within three of the lead, while Michael Hoey - playing on an invite as a former champion - is far from out of it despite a three-over round of 76. He also missed the cut at the Masters last week, the first time he has missed back-to-back cuts since July 2011.