NORTON — Nearly six years removed from his lone Tour victory, the 2010 British Open, Louis Oosthuizen turned in the best round Sunday in Day 3 of the Deutsche Bank Championship.

Oosthuizen finished 7 under for the day, wrapping up his error-free 64 with a birdie on No. 18, attaching the bright red bow to a round that he started off by rifling in four consecutive birdies on holes 2-3-4-5.

Oosthuizen, who finished runner-up to Rory McIlroy here in 2012, teed off at 8:45 a.m. and wrapped up before 1 p.m. while the sun still shined. He noted, however, that the strengthening wind was a factor throughout and he expects it will be even more a factor in Monday’s final round.

“There is a lot of golf left,’’ said Oosthuizen, who spends the year on both the PGA and European tours. “What I’ve heard is that the weather is going to be not great [Monday], so . . . it is really blowing out there now. The first nine holes it started blowing badly and it just picked up the whole time. And finishing on 18 it was really blowing badly.’’

The scoring in the afternoon, Oosthuizen predicted, would be “tough.’’ Such was the case. None of the Round 2 leaders, teeing off late in the day, came near to matching his 64.

“The downwind shots were really fickle,’’ he explained. “Because the greens are firming out a little bit so you can’t really stop it. The best you can do with your wedge is stopping it 10 yards from your pitch mark. So that is what might be tricky. You almost might have a little bit more chance going into the breeze, but obviously with longer clubs. So it’s tough.’’

Oosthuizen entered the week ranked No. 44 in the Fed­Ex Cup and ranked No. 17 in the world. With nearly $2.1 million in earnings this year, he has boosted his career total to $12.3 million.

“I am hitting really good shots,’’ he said. “I am putting a lot better. I am working on those things . . . you know, it is nice to shoot it in a playoff event and put me back into this tournament.’’

Let’s get it started

Jon Curran, in peril of not advancing to the BMW Championship next weekend, will tee off on No. 10 Monday at 9:01 a.m. (11 minutes later than originally announced). Curran will be joined by David Lingmerth, and Zach Johnson . . . Tour officials were adamant that play, if called off Monday, would continue Tuesday. If so, it will tough for many of the players to make it to the BMW in time for Wednesday’s pro-am . . . Oosthuizen’s full name is Lodewicus Theodorus Oosthuizen, leaving him an “a’’ short of covering the vowel spectrum.