James Wade has apologised for his post-match comments following his PDC World Darts Championship second-round victory over Seigo Asada when he said he "wanted to really hurt" the Japanese player.
World number nine Wade has blamed his reaction on a "hypo mania episode which can happen to me at any time".
"I would like to take this opportunity to sincerely apologise for my actions last night," Wade said in a statement on his personal Twitter account.
"Seigo Asada is a great player and I would like to say sorry to him, the fans and the PDC.
Wade, who aggressively shouted at Asada on stage and later said "I wanted to really hurt him in his face", added that the incident was out of character.
"Anyone that has followed my professional career will know that this was very out of character for me and I am disappointed with myself in the way I acted both on the stage and in the interviews after the match," Wade said.
"I was fighting a battle with myself before I even got on the stage due to a hypo mania episode which can happen to me at any time and no one is more upset than I am about what happened.
"I would like again to apologise and hope that people can understand how remorseful I am."
The Professional Darts Corporation has yet to comment on the incident.
World number nine Wade was given a major scare by the qualifier at Alexandra Palace on Wednesday night before eventually progressing to the third round 3-2.
Former player Wayne Mardle described Wade's behaviour as "thuggish" and said there was no place for it in darts.
"I kept giving it to him, I wanted to hurt him, I wanted to really hurt him in his face," an unrepentant Wade told Sky Sports.
"It wasn't a great game but I wanted to hurt him and I wanted to progress. That's for my son, and also for the UK."
Wade, who will face Jelle Klaasen or Keegan Brown next, twice came from a set down to progress, with the major talking point coming when he attempted to intimidate Asada by yelling in his face after levelling at 1-1.
"Does he mean he wanted to punch him in his face? What does he mean? I am absolutely lost for words."@Wayne501Mardle is astonished after an explosive post-match interview from James Wade.— Sky Sports Darts (@SkySportsDarts) December 19, 2018
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Mardle, who was working as a television pundit, was appalled by the incident and felt Wade overstepped the line.
"Does he mean he wanted to punch him in his face? What does he mean? I'm absolutely lost for words," said Mardle.
"That's just not on. The intimidation, overly aggressive, I hope he wakes up in the morning and thinks, 'I've made a mistake there'.
"He can't think that's right and no-one watching it can think it's right. That's thuggish behaviour, there's no place in darts for that."
Wade subsequently released a statement saying that he was sorry for his actions and post-game interview.
Official statement. pic.twitter.com/UsRnZpYKVB— James Wade (@JamesWade180) December 20, 2018
The gripping encounter between Wade and Asada came after Simon Whitlock became the latest big name to crash out of the tournament.
Eighth seed Whitlock, a finalist in 2010, suffered an emphatic 3-0 loss to debutant Ryan Joyce.
The Australian follows 2007 champion Raymond van Barneveld and third seed Peter Wright in making an early exit.
Englishman Joyce, who will meet Alan Norris or Steve Lennon in the last 32, said: "He didn't play anywhere near what he's capable of and I'm happy I was able to take advantage and not blow it under pressure.
"If I can put it all together, I can go a long way but I don't look ahead too much."
Limerick man William O'Connor upset James Wilson after winning a five-set thriller in the opening match of the evening session, while Michael Smith came through a below-par performance to beat Ron Meulenkamp 3-1.
In the afternoon session, Kim Huybrechts produced a fabulous display to whitewash Daniel Larsson and set up a meeting with 12th seed Dave Chisnall.
The 33-year-old Belgian landed six 180s and averaged 103.26 as he romped past the Swedish qualifier 3-0 without dropping a leg.
Fermanagh's Brendan Dolan threw the tournament's first 170 checkout en route to demolishing 14th seed Joe Cullen in straight sets. He will play either Meryvn King or Jann Dekker in the last 32.
In Wednesday's first-round contests, Noel Malicdem came from 2-1 down to defeat Jeffrey De Graaf 3-2 and set up a meeting with Australian Kyle Anderson, while Nathan Aspinall comfortably beat fellow debutant Geert Nentjes 3-0 and will next play sixth seed Gerwyn Price.
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Afternoon Session (1230)
Jermaine Wattimena v Michael Barnard (R2)
Alan Norris v Steve Lennon (R2)
Stephen Bunting v Luke Humphries (R2)
Steve Beaton v Chris Dobey (R2)
Evening Session (1900)
Cristo Reyes v Rowby-John Rodriguez (R2)
Mervyn King v Jan Dekker (R2)
Adrian Lewis v Ted Evetts (R2)
Mensur Suljovic v Ryan Searle (R2)