So 15 years ago a 17-year-old amateur called Justin Rose pitched in at the last hole in the 1998 Open Championship at Royal Birkdale to secure fourth spot. Any heroics today I wonder? Strange thing is that pars will probably earn him glory today. Boom - a birdie putt rolls in and Rose is on -1. That's two birdies in a row. Ouch.
Here comes the wet stuff. The rain is bucketing down and Rose tries a cheeky hook on 14 but finds the sand.
A squally shower we're told and it'll pass soon. It looks pretty unpleasant, but hey, we've all played in this stuff with the temperatures at minus 5 right? #brassmonkeys
Mickelson's putt slides past while Rose mis-connects from the bunker and looks set to drop one. The tension builds.
So it's another par for Mickelson and he's got six holes to go. And it's a disaster on the 13th with his ball missing the green and finding some really sticky horrible long stuff. Rose misses his par putt.
Day has his head in his hands as his putt drifts just wide. That would have been the perfect way to hit back from his bogey. (+2)
Hole 13: Mickelson tells the spectators "put your phone away" and scoops the ball out of the long grass to the back of the green. As best as he could have hoped for.
Mickelson misses a tricky putt and that's a bogey. Big groans from the gallery. +1.
13 holes gone for Hunter Mahan and his card's got one bogey and a dozen pars. Just what the doctor ordered.
After the madness on the third hole when Luke Donald slapped his ball into a female spectator on the bank, Rickie Fowler comes to close to whacking someone in the sitting gallery at the 17th. Mr Tango is unhappy and tries to chomp on his club as one lad in the stand gets up and reveals he's caught the ball...well played sir.
Birdie putt for Rose at 15......ooohhhh and it just rolls past. While Day battles back to save par on the 16th.
Fab comeback with the putter as Mickelson saves par on the 14th. How crucial could that be?
The sun has now got his hat on at Merion as Mickelson prepares to tee off at 15..."c'mon baby. c'mon baby go go go".....that's a whopper from Leftie. Rose up next on the 16th and his ball lands nicely on the front of the green...but then rolls back. Par will be tough.
We're officially into the business end of the 113th US Open. How do you see this going?
Fist pumped and Jason Day holes another corker to save par. +2.
Bit tricky for Rose though and h'll have a horrible 12-footer for par at 16...and here it is...and its lips to the left. BOGEY TIME. All tied at the top again.
Classics squeakybum time. I know these boys are pros but this is pressure and it's building.
Mahan plops the ball into the middle of the green on 15. Mickelson's got a tricky chip off the flat stuff but he's over-cooked it and it's gone too far. My instinct says Mahan and Rose are playing the cooler golf as the finish line approaches. Hunter wiggles his putter and the ball drifts off to the right. That's a shot dropped.
And here's Jason Day on the 18th who's plonked his ball into the sandy trap.
Mickelson's putt goes wide as well. And here's Rose on 17 with a chance from the apron. Hole this and he could be dreaming of something very silver....but that's a tap in for a par (+1) ..that might just be enough you know. Oh lordy...it's all going. Mahan looking edgy and he's three putted.
So much for my chat on Mahan keeping cool. About as cool as a pair of my socks this weekend lying at the bottom of my laundry basket. Mahan tees off with a rainbow in the distance. Safe but has he blown it?
Rose smacks his ball on the 18th and that's straight down the middle. Day bogeys his last hole to finish on 71 and is on +3.
Mickelson is described as an "amazing human being" by Butch Harmon as he gets within 10 feet on the 16th. Brilliant. Two holes up, Rose is standing right next to the Ben Hogan plaque. Mahan stays on +3 ....here comes Rose....
Birds are tweeting, wind is blowing, flags are flapping and Rose's ball flies and flies and flies and rolls to the pin and lands at the back. Should be a par. And as Mickelson misses on 16 with his putt, could the English flag be getting primed in the clubhouse.
Mickelson's on the tee at 17....it lands 50 feet from the pin t the ball starts to slip back. Rose on the 18th and he's playing off the edge with a fairway wood. And here it comes.....and ohhhhh the ball sits on the edge of the cup, looks down and says 'nope, I'm staying out here'....and he ends with a brilliant 70 and he's on level par. Big hugs from Luke Donald who finishes with a 75 and is on +6.
Any more drama left on the Merion stage? Polite applause for Rose as he walks off.....