Rory McIlroy chasing career Grand Slam at Augusta
McIlroy opens with one-under-par 71
Jordan Spieth leads by three on -8
England's Justin Rose tied second on -5
Defending champion Bubba Watson finishes -1
Sergio Garcia -4; Paul Casey -3; Tiger Woods +1
Paul Casey is going to have some nightmares tonight if he's not careful. The approach to 18 I mentioned leaves a nasty uphill chip, that drops short and he putts from the fringe. The putt loops right to left away from the hole and this is now tricky for bogey. A double looms...
Image source, Getty ImagesEngland's Ian Poulter, who finished +1 despite taking an early lead at -2, has revealed his frustration with his short game today. In a tweet , externalthat starts with an expletive, he wrote: "I only missed 5 greens, 1 up and down. Then 6 over for the other 4 greens missed."
John Murray
BBC Radio 5 live commentator
"Paul Casey is back in the top-40 in the world and it is a welcome upturn in form. It is great to see his confidence back."
If I had a pound for every time I've read positive stuff about Brooks Koepka I'd have at least a fiver in my pocket.
The 24-year-old can absolutely smash the casing off a ball and he has an eagle putt on eight. It's long, make sits way up to the hole, the line is off but that will do him for a birdie and three under.
Now then, Paul Casey is wearing a cap brighter than the sun. His ball on 18 practically orbits the sun as it whistles over the green and beyond. A nasty - no very nasty - chip awaits.
Image source, EPAA ping from Webb Simpson from the thing rough on 18, he does the exact same thing as Bill Hass, greenside bunker. The Americans are following one another up the final drag. What a sweet noise there was on that strike.
Don't undo all your good work now Webb... three under for the day would be a great start.
No birdie joy for Lefty and Rory on 16, both will have short putts for par. Bill Haas on 18 dribbles one past and will end on bogey, two off the lead.
Here is Tiger fifth hole, a left to right swinger from 25 feet... nope. A nice read but not the pace needed. Par.
He is one over with five done, would he have taken that?
-5 Hoffman (US), Rose (Eng) -4 Henley (US), Casey (Eng) 16, Palmer (US) 8 -3 , Els (SA) 10, Mickelson (US) 15 Haas (US), Simpson (US) 16, Matsuyama (Jap) 16 -2 Streelman (US), Reed (US), D Johnson (US), Schwartzel (SA) 15, Cabrera (Arg) 9, Koepka (US) 7, Spieth (US) 6, Fowler (US) 3.
Selected others: -1 Willett (Eng), T Watson (US), Gallacher (Sco), Harrington (Ire) 8, Garcia (Spa) 3, B Watson (US), McIlroy (NI) 15.
Image source, Getty ImagesRickie Fowler is never short of colour and his start has been bright. Dulled a little here though as he tickles a putt on the fourth hole - not enough gas. Bogey.
Image source, AFPTiger Woods, white shirt, grey slacks, white cap. Centre of the fifth fairway he rockets one and gives it the full gaze - solid into the heart of the green. An outside birdie chance.
Rory McIlroy is on the par three 16th tee, picturesque over water. This is the famous green which slopes down to the hole on the final day and McIlroy plants his tee shot on the dance floor. It will roll down the slope for a tap in will it? No. Clings to the brow of the slope and he will now have a long putt across the slope. Margins. Very fine.
Image source, ReutersBill Haas is four under par coming up 18, he sets one up from the left side of the fairway... wooosh. That swing noise is wonderful but is the shot? Not really, he pushed it right into a greenside bunker. Work to do for the American if he is to stay one off the lead.
Iain Carter
BBC golf correspondent on Radio 5 live
When Bobby Jones and Clifford Roberts first conceived the idea of Augusta National they envisaged a membership of around 1800 people with an entry fee of $350 and annual subs of $60. Actual membership levels are thought to be around 300.
Image source, Getty ImagesNow then, McIlroy has 21 feet for birdie on 15, surely not... YES! That ball rolls around the inside of the cup. Birdie, one under. Bogey for Woods on four - one over for day one.
Image source, Getty ImagesWhat then for Jordan Spieth - 21 years of age, two PGA Tour wins already, his most recent less than a month ago.
He tonks one into trees on seven but produces a stunning second to land 11 feet from the yellow flag. Delightful.
Image source, ReutersNoh Seung-yul is another Masters debutant and his belly will probably be doing flips on Amen Corner. A par three, over water, the crowd watching on... plants it 20 feet from the pin. Wipe your brow son, a job well done.
Tiger will make bogey at best on four, his effort from the fringe of the green goes past. Jordan Spieth is living up to his pre-tournament hype, two under through six.
"I worked my ass off. That's the easiest way to kind of describe it. I worked hard."
Image source, Getty ImagesTiger Woods did not hold back on describing his journey to the Masters after leaving us all in suspense as to whether he would turn out.
The 14-time major winner took an indefinite break from golf to get his game tournament ready, now he says that time is "finally" here.
"People would never understand how much work I put into it to come back and do this again, it was sun up to sun down," he said.
Woods has just chipped from the sand over the flag t the fringe of the green and will have a tester for par on four - seven yards.
Jay Townsend
Former American professional golfer on BBC Radio 5 live
"My prediction is 149. That is the number I predict for Tiger's first two rounds. Five over and outside the cut line."
Image source, Getty ImagesTiger watch - the eyes in the galleries focus on his frame as he lines up on the par-three fourth.
The hole named Flowering Crab Apple measures 240 yards but there are no flowers growing where Tiger's going - sand.
Front-right bunker gobbles his ball. The yo-yo start continues. He started bogey, birdie, par, needs an eagle and maybe a double bogey for a full house. This hole could be problematic now.
Image source, ReutersHow about a birdie-birdie start? Is it one of the outsiders feeding off adrenaline? Nope - Rickie Fowler.
Tied for fifth last year, this young man has major-winner written all over him (not literally).
Angel Cabrera makes the turn two under - a former champion chalking up some early red numbers.
Image source, Getty Images
Image source, APThe defending champion Bubba Watson ends with bogey to conclude one under for the day. No major damage but a blip to finish.
What about the US Open champion Martin Kaymer? He destroyed the field to land that title in 2014 but he can only par the 13th - a par five - to stay +3.