In the evening sunshine, DeChambeau has done just the same. Whenever he plays a bad shot, DeChambeau looks seriously wronged, as it someone has served him an injustice. It's made worse by his white cloth cap, the type Dickie Bird wore.

Image source, Getty Images

Jay Townsend
Former American professional golfer on BBC Radio 5 live sports extra

"That is a big mistake from Jordan Spieth going over the green."

Spieth found the fairway at 17, good position. Now the approach. He doesn't like it. It's over the back and down the slope. Not great, but not horrendous.

Casey, by the way, also bogeyed 16. That's three dropped shots in a row for the Englishman, who is back to one over. Now, his tee shot on 17 has gone right and is in the trees.

-5: Spieth (After 16 holes)

-3: McIlroy (18), Dechambeau (A) (16)

-2: Lee (18), Piercy (18), Matsuyama (14)

Selected others: Par:  Lowry (18), Garcia (18), Willett (18), Rose (12) +1: Casey (16), Day (18) +2:  Westwood (16) +3 Poulter (18), +4: Mickelson (12)

Follow these links for tee-off times and a full leaderboard, external.

John Murray
BBC Radio 5 live sports extra commentator at Augusta National

"That was most unlike Jordan Spieth."

Now then. Here's something you don't see very often. The metronomic Jordan Spieth has missed his par putt at the 16th, not reading the break from right to left. DeChambeau too! Bogeys for both men. Spieth to five under, DeChambeau to three under. Are you watching Rory McIlroy?

In all of that, Jordan Spieth crept up the 16th and left a big un for birdie. Dechambeau and Casey did the same. All three left them short. For Casey, it rolled back and ended up further away. The best round of the day, by the way, is one under. Amateur Dechambeau is currently four under.

Matthew Birch: I wasn't even alive when Tom Watson won his last major, but that got me emotional. What a player. What a guy.

The crowd rise once again to Tom Watson, this time with sustained applause. A hug for his wife, a handshake from Ben Crenshaw, who is watching. Smiles an tears. Just imagine having accomplished what this man has. Wonderful stuff.

Image source, Getty Images

Steve Tooker: Watching in Tokyo and even the entirely Japanese commentary doesn't prevent Tom Watson bringing a tear to one's eyes on 18

Iain Carter
BBC golf correspondent at Augusta National

"Tom Watson has as wide a smile as when he won this in the past. And so he should because that was phenomenal from Tom Watson."

It was almost incredible. From miles away, Watson set his ball way to the left of the hole, the entire crowd willing it to break. It starts, it rolls, has it got the legs? No, the red spots fall just short. He finishes, removes his cap, and salutes the gallery. Wonderful stuff.

Image source, AFP/GETTY

Iain Carter
BBC golf correspondent at Augusta National

"These are emotional scenes. Everyone is standing, everyone is applauding and that is right for a great ambassador and a great player."

Jay Townsend
Former American professional golfer on BBC Radio 5 live sports extra

"I was lucky to spend time away from the course with Tom. He is a really thoughtful guy. He thinks about things before saying them and has been an ambassador for the game. He has been a tremendous player and one of the true greats."

What an ovation. The entire 18th gallery is on their feet, cheering a legend and gentleman of the game. The two-time Masters winner (eight majors overall) looks like he's got a tear in his eye. Emotional moments.

Image source, Reuters