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Three-time major winner Brooks Koepka and fellow American Bryson DeChambeau share the lead after a superb opening round of the 83rd Masters.
Koepka shot a bogey-free 66 while DeChambeau, who hit the pin with his second shot to the last, tapped in for birdie to also score six under.
Three-time champion Phil Mickelson, hoping to become the oldest major winner in history of the tournament at the tender age of 48, is third on five under, while 43-year-old Englishman Ian Poulter is joint fourth alongside world number two Dustin Johnson on four under.
Spain's Jon Rahm and 2013 Masters winner Adam Scott are in a group on three under while four-time champion Tiger Woods is a shot further back on a congested leaderboard. Tiger missed 4 five foot putts on the way round. but if he can sink similar putts over the weekend he will be right in the mix on Sunday afterneoon.
Northern Ireland's Rory McIlroy began his quest for the only major he is yet to win with a one-over 73, while world number one Justin Rose, who was four over after nine, holed birdies on the 15th and 17th holes as he carded a 75.
Poulter leads British and Northern Irish hopes
Five birdies and just one bogey signalled a spectacular start for Poulter, who is making his 14th Masters appearance.
"I saw a stat that says at 43 there's a three per cent chance to get the Green Jacket so I have nothing to lose. I can freewheel," said the Englishman.
Tommy Fleetwood, who had three birdies and two bogeys in a 71, is the only other British or Northern Irish player under par.
Tyrrell Hatton bogeyed the last to finish one over, while debutant Eddie Pepperell had a mixed bag on the second nine with four bogeys and two birdies as he posted a two-over 74.
Danny Willett, champion in 2016, opened with a 75, as did Wednesday's par-three winner Matt Wallace, who said he "did not enjoy" his round. "I couldn't hit a nine-iron on to the green from 125 yards. It was shocking."
Matthew Fitzpatrick dropped five shots in his closing five holes to finish six over, while Paul Casey closed bogey, double bogey to card a nine-over 81.
Former champions Sandy Lyle and Ian Woosnam are the only players representing their respective countries. Scotsman Lyle had three birdies in a one-over 73, while Welshman Woosnam had a quadruple-bogey eight on the 11th as he finished eight over.
