Rory McIlroy has issued an apology after pulling out of the Honda Classic in Florida midway through the second round.
The world No 1 was suffering severe pain from a sore wisdom tooth as he covered his first eight holes at PGA National in seven over par before finding further trouble at the 18th and walking off.
The PGA Tour soon confirmed that McIlroy withdrew due to "severe wisdom tooth pain affecting concentration", and the defending champion later issued his own statement on the matter.
"I sincerely apologise to The Honda Classic and PGA TOUR for my sudden withdrawal," McIlroy said. "I have been suffering with a sore wisdom tooth, which is due to come out in the near future.
"It began bothering me again last night, so I relieved it with Advil. It was very painful again this morning, and I was simply unable to concentrate. It was really bothering me and had begun to affect my playing partners.
"I came here with every intention of defending my Honda Classic title. Even though my results haven't revealed it, I really felt like I was rounding a corner.
"This is one of my favorite tournaments of the year and I regret having to make the decision to withdraw, but it was one I had to make."
McIlroy's struggles began with a double-bogey at the 11th - his second - and he dropped another shot at 13 before he found water twice at the 16th and carded an ugly triple-bogey seven.
He leaked another shot at 17 and dumped his approach to the 18th into the lake before walking back to the clubhouse without completing the hole.
Since his much-publicised equipment switch to Nike, McIlroy has missed the cut in Abu Dhabi before crashing out in the first round of the WGC-Accenture Match Play last week.