Mickelson found wanting as rivals hand it to Glover.
PHIL MICKELSON came up short in a US Open for the fifth time in his career as Lucas Glover held his nerve to claim a two-shot victory on a dramatic final day at the 109th US Open.
Glover had started the day with a five-shot lead over the field at seven under par alongside co-leader Ricky Barnes as the rain-delayed championship moved into a fifth day at Bethpage Black.
Barnes disintegrated with six bogeys in seven holes and Glover was caught by Mickelson and David Duval at four under and three under, while England's Ross Fisher also challenged.
Yet his rivals fell away at the most crucial time of all, all bogeying either the 15th or 17th holes or both as 29-year-old
Glover stayed calm.
Glover, with one previous victory on the PGA Tour back in 2005, won his first major with a one-birdie, four-bogey final-round, three-over 73, good enough to hold off Mickelson (70), Duval (71) and Barnes (76) by two strokes.
Fisher claimed fifth, his best majors finish, a further shot behind following a 72 with 2008 winner Tiger Woods tied for sixth at level par alongside fellow American Hunter Mahan and Denmark's Soren Hansen.
Rory McIlroy finished in a tie for 10th on his US Open debut.
The tournament had been blown wide open by a fi- nal-round collapse from third-round leader Barnes.
The Californian, without a victory in six years as a professional, saw his final round implode as play resumed at the par-70 course.
When play resumed yesterday, the first time since 1983 a US Open had needed an extra day to complete 72 holes, Barnes found the second green out of the rough to make par.
Fisher, runner-up behind Paul Casey at last month's BMW PGA Championship at Wentworth, rolled in a three-foot birdie putt at the par-five fourth to get back to three under - four shots behind Barnes - with Glover bogeying the third to slip to six under.
World number two Mickelson bogeyed the sixth and David Duval, in the wilderness since his 2001 Open victory at Lytham, was quickly in trouble with a triple bogey at the par-three third.
However, he sunk a birdie at the par-five fourth to get back to level par - and would stick around for the rest of the day.
Everything changed when Barnes began to slide back to the field. He and Glover bogeyed the fifth hole but Barnes would bogey three more in succession to fall to three under after eight as Glover assumed the lead at five over.
Then Glover bogeyed the ninth and was leading at four under after 10 with the tournament wide open.
Fisher had bogeyed the fifth and the seventh to drop to one under but a super iron shot to inside two feet led to a birdie and after nine holes he was within two shots of the lead at two under. Barnes fell apart - then the four-time runner-up got to two under with a birdie at the 12th.
Fisher sent in another great approach shot at 12 but missed the par putt from inside two feet to fall back to one under.
Mickelson made the first eagle of the tournament on par-five 13 to join Glover in a share of the lead at four under.
Fisher swiftly added the second eagle there to bounce back in style at three under, one off the lead with five to play as Barnes went further backwards at the 12th with his sixth bogey in seven holes.
On an ever-changing leaderboard,
Mickelson bogeyed the 15th to drop to three under and Fisher followed to fall to two under while Duval shot a rare birdie to get to the same mark.
Then Glover bogeyed 15 and fell into a joint lead with Mickelson at three under.
But Glover managed to score his first birdie of the day at the 16th and the 29-year-old was back in front at four under, two shots to the good for a lead he would not relinquish..
FIRST MAJOR: Lucas Glover holds up the championship trophy after winning the US Open in Farmingdale