Former Ryder Cup player Francesco Molinari is another with that red mallet putter and he has returned a 64 with it, matching Matsuyama. The Italian, world ranked 21, is five under for the Championship.

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Two birdies in a row for that distinctive putting style of Chris Stroud but he misses a putt on the 12th and is back to five.

Five pars in a row for The Open champion Jordan Spieth and he remains two over over the Championship with two to play.

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Two 50-something former winners are playing together and 54-year-old Vijay Singh looks set to make the cut after chipping in for an eagle at the seventh, his 16th, to get back to three over. John Daly's trousers are typically indescribable but he's not going to make it, he's 10 over.

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An exquisite flop shot over the bunker gives Day a chance to go within one of the leaders but he misses from six feet and stays at minus six.

Shane Lowry had four birdies in six holes to reach two under but a disastrous triple bogey six at the par three 17th resulted in a 69 and a one over halfway total.

Matsuyama misses his birdie chance, but pars the 18th to complete a superb round of 65 which leaves him in the lead on eight under together with Kevin Kisner.

Here's the Japanese player's bunker shot at the 16th that helped save par and keep him on track.

We haven't see much of Paul Casey today but he has just rolled in his third birdie in succession and he is three under.

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As we stand there are 78 players on five over or better so that's looking like the cut mark, which will be one too many for Englishmen Justin Rose and Ross Fisher.

Two birdies in a row for Day and those who thought the storm had derailed his chances were wrong. He negotiates a curling four footer and he is six under now.

American Chris Stroud, who did not drop a shot yesterday, reaches five under. He has an unusual putting grip, it's a long putter but he does not anchor it to his body so it's all within the rules and he is in a share of third. My aunt used to putt like that, with a normal size putter, because she was very short.

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Matsuyama has a 13-foot putt for birdie, and the lead, at the 18th. Can he finish off a magnificent round in style?

Here's the chance for Matsuyama. He's got seven feet on the 17th green to draw level with leader Kevin Kisner.

Never. In. Doubt.

This is a quite brilliant round. Five birdies in six holes now. He couldn't take the outright lead on the last, could he?

Meanwhile, Matsuyama's playing partner Ian Poulter has just fired in a 15 foot putt for birdie to move to +2. He's definitely going to be here for the weekend.

Jay Townsend
Golf expert on BBC Radio 5 live sports extra

Spieth looks to be a better putter after the delay. You can tell by his speed and demeanour.

The big three major winners find it hard going on the 289-yard par four 14th, Garcia sends a chip sailing over the other side of the green into the rough and drops another shot, Koepka misses for par on the left, but Spieth, having played backwards instead of risking going over a bunker with the water beyond, makes par.

That's more like it from Day, that must have been over 40 feet and it rattles into the cup for a birdie to take him back to five under. DJ cannot match him and he remains at one over.

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Hideki can do no wrong. He was a tad unfortunate to spin back into the bunker but makes his shot from the sand look simple as ball cuddles up to the flag. The world number three taps in for par to stay one behind Kevin Kisner.

He's got two holes left. Can he draw level?

A 10-foot birdie chance for Day slides by the right edge and he remains four behind clubhouse leader Kevin Kisner. Playing partner Dustin Johnson remains at one over but Henrik Stenson drops back to plus three.

Peter Alliss
BBC Sport commentator

It is a different course after that rain.