NORTON, Mass. - Jason Day capped off an exciting day with a routine birdie to take the lead after three rounds in the Deutsche Bank Championship Sunday, setting up a Labor Day finish with all sorts of possibilities.

Day watched a three-shot lead evaporate in two holes, only to get it back on the par-5 18th with a shot just off the back of the green, leaving him a simple two-putt for birdie and a 5-under-par 66. He had a one-shot lead over Brandt Snedeker, who made a mess of the 18th until chipping in for par and a 67.

Just like so many other times at this tournament, the Deutsche Bank Championship could be up for grabs. And so could the No. 1 ranking.

Tiger Woods could only manage one birdie over the last 11 holes and shot 2-under 69, leaving him tied for 23rd and 10 shots out of the lead. "I think I played better than what my score indicated," Woods said. "I had a lot of putts that I didn't make."

It all set the stage for Phil Mickelson or Steve Stricker to end Woods' five-year run atop the world ranking. Stricker is closer to the lead. Mickelson has better odds.

This is the 10th tournament this year that Mickelson has had a mathematical chance of replacing Woods at No. 1 in the world, and one of his better chances.

"I haven't paid attention to what needs to happen," Mickelson said. "But I'm looking forward to getting in the hunt tomorrow and seeing if I can get off to a good start and make some birdies."

Mickelson and Stricker might have a tough time catching up to Day, the 22-year-old Australian who won the Byron Nelson Championship in May and is starting to play his best golf during the FedEx Cup playoffs. Day was at 17-under 196, matching the 54-hole record at the TPC Boston set by Mike Weir two years ago.

Luke Donald, winless on the PGA Tour in more than four years, was steady again in his first tournament since being picked for Europe's Ryder Cup team. He birdied the last hole for a 66 and was two shots behind.

Defending champion Stricker played his third straight round without a bogey for a 67 and was at 13-under 200 with Charley Hoffman, who had a 69.

Mickelson was in a group at 201 that included Geoff Ogilvy (65), who hasn't finished in the top 10 since winning the season-opening SBS Championship; and Adam Scott (65), who won the Deutsche Bank Championship in 2003.

Sunday was a day for plenty of noise.

Vijay Singh made the rarest shot in golf - an albatross - when he holed a 5-iron from 229 yards on the par-5 second hole for a cheer that resounded across the front nine of the TPC Boston.

"I hit it just like I wanted to and was hoping it was going to get up on the green somewhere, and it went in the hole," said Singh, who had a 69 and is right on the bubble for getting into the third round next week at the BMW Championship.

More golf news