The American seeks his second major title with a one-shot lead at Oak Hill.
The Northern Irishman shot a 71 on Friday to climb back into contention.
Tiger Woods struggled after the turn during the first round and finds himself tied for 47th in the final major of the year.
Jim Furyk had a strong opening round of the PGA Championship.
Most players would be thrilled to be atop the money list and the Fed Ex Cup standings, but Tiger Woods has far more lofty goals to fulfill beginning Thursday in the first round of the PGA Championship.
The Australian had his struggles in the British Open with the PGA Championship looming.
The Northern Irishman finished tied for 27th at Firestone, as the PGA Championship looms.
The top-ranked golfer enjoyed one of his most dominating efforts in years.
The 37-year-old American shot an incredible nine-under 61 on Friday afternoon at the WGC Bridgestone.
Tiger Woods and former caddie Steve Williams appeared to bury the hatchet during Sunday's 2013 British Open Championship and signal an end to their long-running feud.
Playing some of the best golf of his career, he made up for his sixth runner-up U.S. Open showing.
Only three players are shooting under par after three rounds at Muirfield.
The 37-year-old American is one stroke back from the lead as the third round of the British Open takes place Saturday afternoon at Muirfield.
Spain's Miguel Jimenez is the leader after two rounds, but Tiger is only one stroke back heading into the weekend at Muirfield.
Zach Johnson will take a narrow lead into the Open second round, but Tiger Woods is handily placed.
Tiger Woods shot a two-over, 69 in the first round of the 2013 British Open.
The Northern Irishman had a difficult opening round on Thursday.
Tiger Woods, Phil Mickelson and Justin Rose lead the betting odds for the 2013 British Open.
An elbow injury has kept Tiger Woods out of action for almost a month, but the American is still favored to win The Open next week.
Lee has never won a tournament since entering the PGA Tour in 2007.
The American golf star has been suffering from minor discomfort.
Rory McIlroy found the water on the 11th hole at Merion Golf Club and took out his frustration on his wedge, eventually making a quadruple-bogey on the par-4.
The 32-year-old edged Phil Mickelson in the final round at Merion.
It was reportedly the 43rd ace in U.S. Open history.
The entire field has struggled with Merion this weekend, except for Phil Mickelson.
The American is just ahead of Hunter Mahan, Charl Schwartzel, and Steve Stricker.
The American is please with his play but not with the results at the 2013 U.S. Open
The U.S. Open continued Friday after rain and thunder storms cut the first round short.
American Phil Mickelson was the early clubhouse leader after shooting a three-under-par 67.
Heavy rains are expected throughout the day, and it is unclear when play will start again at Merion GC.