Rory McIlroy was left frustrated after the opening round of the Players Champions at TPC Sawgrass in Florida.
The Northern Irishman had made a flying start but dropped three shots in his last seven holes to see him card a two-under par 70.
McIlroy began on the 10th hole with two birdies but cancelled one out with a bogey on the 12th. However, with more birdies at the 16th and 18th he sat on 3-under at the turn.
Two more birdies on the first and second holes saw the 25-year old reach five-under and put him in a decent position. But disappointing bogeys at the third, sixth and eighth saw him ruin much of his excellent start.
McIlroy saw the positives in his opening round and believes he card a lower second round.
"I played really solid for the first 11 holes but let a few shots get away from me at the end," McIlroy, who is seven shots behind early leader Martin Kaymer, told reporters.
"Guys are going low so 70 is going to be pretty average by the end of the day but I feel like my game is in good enough shape that I can go out tomorrow and shoot something in the 60s.
"It's a course that has frustrated me in the past but I feel like I learnt how to play it last year. I'm coming in disappointed with a 70 when maybe a couple of years ago I would have been happy."
England's Lee Westwood shot an excellent opening round of 67 to leave him at five-under. He won his 41st professional title last month in Malaysia and teed off in the first group as he hit his front nine in 33 shots with birdies on 12 and 16 saw him complete a flawless round.
Westwood admitted that he enjoyed teeing off first as it has it's advantages.
"It's probably been about 21 years since I was the first ball in the air at a tournament," said the 41-year-old afterwards.
"Actually I had a little chuckle and thought, this is great. This is like having a handicap again, getting a shot. Being first out is brilliant; it's a great tee time. I love it.
"It's better than being last out. Pace of play is nice, no spike marks. Nice playing partners to play with. Yeah, it was a nice morning to be playing golf.
Westwood was pleased with his round and believes that he has taken the confidence of the win in Malaysia with him to Florida.
"I played really well. I got off to a nice start and then got a bit of momentum. I hit it good all day, he said."
"It was a really solid 67. I couldn't have really done any worse.
Westwood added: "There's nothing like winning a tournament to give you confidence, more mentally than anything, that when you get into a position to win, you can finish it off.
"I've won 41 times so I'm obviously good at winning when I get a chance. But it's always nice to reaffirm that whenever possible, and I did everything right in Malaysia."
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