A day that started for most at 7:00 a.m. EDT concluded for many at 8:20 p.m. in Harrison, N.Y.
When darkness ultimately stopped play in the second round, Sergio Garcia and Scott Hoch headed an unfinished field.
Garcia and Hoch are tied at 6-under-par. Garcia is 3-under through 10 holes of his second round, while Hoch is 2-under through nine holes.
Five players are tied at 5-under-par,including Gabriel Hjertstedt who still has eight holes to complete in his second round.
Stewart Cink (72), Robert Allenby (68), J.P. Hayes (69) and Vijay Singh (70) are all in the clubhouse at 5-under.
Play will resume at 7:00 a.m. Saturday.
Singh struggled with his putter in the second round, but still managed to drop in three birdies and an eagle to offset a trio of bogeys.
Singh has won twice overseas this season, but is still seeking his first PGA Tour titles
Tiger Woods played a full-35 holes on Friday. Along the way, he went from possibly missing the cut for the first time in 71 events to contending for the title.
Woods followed an opening-round 4-over-par 75 with a spectacular bogey-free 66 to climb within four shots of the current lead. Tiger stands at 1-under-par 141 entering weekend play at Westchester Country Club.
Click for a virtual tour of Westchester C.C.
The good thing about playing this golf course and this tournament is that you get rewarded for shooting good rounds, said Woods, who hasnt missed a cut since the 1998 Buick Open.
Tigers day started with a tap-in par at the 1st. However, he proceeded to triple bogey the par-4 4th en route to recording his worst scoring round of the season.
After signing for a 75, Woods turned around and birdied the par-4 10th, his first hole of the second round. It proved to be the first of five birdies on the day.
You go out there and you post a round in the mid-60s, you are definitely going to move up (the leaderboard), Tiger added.
Cink led after a first-round 65. Hes trying to put behind him a disastrous 72nd hole at last weeks U.S. Open, when he missed a two-foot putt that, as it turned out, would have gotten him into Mondays 18-hole playoff with Mark Brooks and eventual champion Retief Goosen.
Cinks second round wasnt as prosperous as his first. The two-time PGA Tour winner carded four bogeys and three birdies for a 1-over-par 72.
Full-field scores from the Buick Classic