McDowell, 30, came from three shots behind overnight as third-round leader Dustin Johnson imploded early on.
Westwood has been paired with Martin Kaymer against Phil Mickelson and Dustin Johnson in the first fourball.
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World number two Mickelson was with Dustin Johnson, with the pair playing Bubba Watson and Jeff Overton.
John Daly, Mark Calcavecchia and, among today's stars, Rickie Fowler, Rory McIlroy and Dustin Johnson all play fast.
Mickelson ended alongside Ernie Els, Dustin Johnson and Ryo Ishikawa with Paul Casey in a group at even par.
BBC: US Open: Graeme McDowell leads as Phil Mickelson surges
Dustin Johnson was and is personally responsible for what occurred on Sunday afternoon on the 72nd hole at Whistling Straights.
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Meanwhile, top American names Anthony Kim, Dustin Johnson, John Daly and Lucas Glover will not be returning for the final two days.
But here's a tip: Woods, Donald, McIlroy, Bradley and Dustin Johnson all play regularly at Jack Nicklaus's Bear's Club in Jupiter, Fla.
Defending champion Steve Stricker lounged on a sofa in the dining room watching the NFL playoffs with Dustin Johnson and Brandt Snedeker.
Dustin Johnson and red-hot Rickie Fowler might be the top American hopefuls.
On the other side of the coin, Dustin Johnson seemed early in the Friday round as if he might run away from the field.
WSJ: At the Masters, the Eighth-Grader Gets Detention | Golf Journal by John Paul Newport
Ian Poulter and Ross Fisher are tied with Tiger Woods and Steve Stricker, while Lee Westwood and Martin Kaymer lead Phil Mickelson and Dustin Johnson.
Dustin Johnson, who won the wind-hit season-opening Tournament of Champions at Kapalua on Tuesday, pulled out after nine holes of his second round due to illness.
It was the third time the teenager had played with world No. 1 Woods, with the pair joined on their Monday practice round by big-hitting American Dustin Johnson.
When Dustin Johnson kicked off the 2013 PGA Tour season by winning its first event in Hawaii last month, he was using the hottest driver in the game.
Immelman opened Thursday with a bogey-free 68 (only Sergio Garcia also avoided bogeys) and followed Friday with a 75, to finish like Dustin Johnson and Stricker at one-under for the tournament.
WSJ: At the Masters, the Eighth-Grader Gets Detention | Golf Journal by John Paul Newport
He led the field in driving distance (tied with Dustin Johnson with an average of 311 yards) and in scrambling (getting up and down in two shots from near the green).
Dustin Johnson's dad was also a teaching professional.
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It was an unfortunate incident for Dustin Johnson.
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Germany's Martin Kaymer shot 68 to finish third on eight under with England's Lee Westwood (71), Sweden's Henrik Stenson (67) and Spain's Alejandro Canizares (71) eight shots back and American Dustin Johnson (69) nine behind.
He's been at the epicenter of the pro-golf world for a couple of decades, working with Davis Love III, Greg Norman, Fred Couples, Ernie Els, Adam Scott, and now Dustin Johnson, Nick Watney and Phil Mickelson.
Pebble Beach National Pro-Am, for example, TaylorMade players such as Dustin Johnson, Retief Goosen and Robert Garrigus will be wearing high-visibility yellow bucket hats, at least part of the time, to promote the company's latest RocketBladez irons.
WSJ: How TaylorMade Made Its Move | Golf Journal by John Paul Newport
Pebble Beach National Pro-Am, for example, TaylorMade players such as Dustin Johnson, Retief Goosen and Robert Garrigus will be wearing high-visibility yellow bucket hats, at least part of the time, to promote the company's latest RocketBalz irons.
WSJ: How TaylorMade Made Its Move | Golf Journal by John Paul Newport
Other pairings included Masters champion and world number two Phil Mickelson with Rickie Fowler, the youngest player in the US team at 21, Jim Furyk and Jeff Overton, Stewart Cink and Matt Kuchar and Bubba Watson and Dustin Johnson.
Kuchar may be as good a bet as anyone to take home this year's trophy, because TPC Sawgrass favors shot-makers like him, not bombers like Dustin Johnson or Rory McIlroy, who has missed the cut in all three visits to Ponte Vedra.
It began early in the morning with Darren Clarke, the 42-year veteran from Northern Ireland, fending off challenges from talented Americans Phil Mickelson and Dustin Johnson and battling wind and rain to capture the first major of his career, his beloved British Open.
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And unlike professional tennis that has very few if any young American stars on the cusp of a major championship, several top American player such as Bubba Watson, Rickie Fowler, and Dustin Johnson have each been quite competitive in major championships and are knocking on the doorstep.
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