Robert MacIntyre also reacted angrily on the 17th hole
Scotland's Robert MacIntyre could face disciplinary action at the Masters after he directed a middle finger at the 15th green during a quadruple bogey.
The 29-year-old plunged towards the bottom of the leaderboard after his nine on the par-five hole, ultimately posting an eight-over-par 80.
The left-hander offered the gesture after he struck his approach into the pond guarding the front of the green.
Having taken a penalty drop, his next shot again found the water, and then after taking a second drop, flew his ball over the green.
MacIntyre also reacted angrily to his second shot on the 17th, slamming his club into the ground, and did not speak to the media after his round.
He also swore after a slightly wayward tee shot on the par-three 12th hole and again after hitting a putt off the green on the par-five 13th, although he did record pars on both.
Masters organisers are known for their strict rules and MacIntyre could be in further trouble.
He was picked out by some observers as a potential contender for the title after finishing fourth at the recent Players Championship.
He then led after the third round at last week's Texas Open, but was overtaken by JJ Spaun to finish as runner-up.
Defending champion Rory McIlroy and American Sam Burns posted five-under-par 67s to lead the Masters after the first round.
MacIntyre was already three over par before getting into major trouble on the 15th hole
Co-leader McIlroy's golf does the talking after busy Masters build-up
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