Rory McIlroy admitted "frustration got the better of me" as he apologised for hurling a club into water during the second round of the WGC-Cadillac Championship.
The world No 1 is expected to be fined by the PGA Tour following his remarkable display of temper at the par-five eighth hole, where he turned an excellent birdie chance into a bogey-six.
McIlroy had got off to an encouraging start with birdies at the first two holes, but he bogeyed the next after blocking his tee-shot into water and he then took three putts from short of the green at the short fourth.
Rory McIlroy
He got back on track with a 25-foot birdie putt at the seventh, and he found the fairway at the eighth and took dead aim with a three-iron from a little over 220 yards.
But he tugged the shot way left of the green, and the ripples in the lake had barely subsided when he angrily hurled the offending long-iron into the water before composing himself ahead of his fourth shot.
Claims that Tiger Woods is serving a one-month suspension - rebutted by the player's agent and the PGA Tour - have been withdrawn.
Former world No 1 Woods is taking an indefinite break from golf as he attempts to get his game "tournament ready" after a poor run of form and injuries.
Former Tour player Dan Olsen, who played in 35 Tour events between 1989 and 2011 - missing 22 cuts - alleged in an interview on US radio station 730AM The Game on Friday that Woods was serving a drugs ban, but on Monday retracted his claims and issued an apology to the 14-time major winner.
"I retract the entire interview," Olsen said in a statement on the radio station's website. "My comments were ill-advised. I want to apologise to Nike, the PGA Tour, Phil Mickelson, Tiger Woods and (Tour commissioner) Tim Finchem."
The allegations had brought a strong denial from the PGA, with PGA Tour executive vice-president and chief marketing officer Ty Votaw issuing a statement.
"There is no truth whatsoever to these claims," it read. "We categorically deny these allegations."
Woods' agent Mark Steinberg also quashed the allegations, labelling them "unequivocally and completely false".
"These claims are absolutely, unequivocally and completely false," he said. "They are unsourced, unverified and completely ridiculous.
"The PGA Tour has confirmed that there is no truth to these claims."
Woods has not played since he withdrew from the Farmers Insurance Open at the start of February, less than a week after firing a career-worst round of 82 at the Waste Management Phoenix Open.
No date has been set for the 39-year-old's return, with the Masters at Augusta starting on April 9.
Ian Poulter and Paul Casey will head into the fifth day of the weather-delayed Honda Classic tied for the lead after a marathon Sunday at Palm Beach Gardens.
The staff at PGA National worked through the night to get the course playable following Saturday's torrential thunderstorms, and Poulter earned a three-shot lead after the third round before two big mistakes hampered his progress shortly before sunset.
The Ryder Cup star dropped from nine under to six under in the space of two holes after he followed four solid pars with an ugly shank with an eight iron off the tee at the short fifth, finding water way to the right.
He was unable to avoid a double-bogey five, and the error appeared to be still playing on his mind when he pulled his drive at the next into another lake, although he did well to find the green with his third and limit the damage to a bogey.
Play to resume Monday at 1pm GMT:
-7 P Casey (Eng) 9 holes
-7 I Poulter (Eng) 7
-6 P Reed (USA) 7
-4 D Berger (USA) 11
-4 J Overton (USA) 10
-4 P Mickelson (USA) 8
-4 B Steele (USA) 8
-4 R Knox (Sco) 8
-3 P Harrington (Irl) 7
-2 J Luiten (Ned) 14
-2 J Donaldson (Wal) 9
To his credit, Poulter responded with a superb tee shot to four feet at the seventh which he converted to reclaim a share of the lead with his fellow Englishman Casey, who was the hottest player on the course when play was suspended due to darkness.
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