George Groves says he let himself down, that he got 'complacent for a split second and paid the price', in his super-middleweight contest with Nottingham's Carl Froch.
He is hoping that his new fan base sticks by him in future though:
"I'm very disappointed with tonight. Very, very disappointed. I'll go back and I'll watch it back and no doubt I'll be even more disappointed and frustrated. I feel like I've let myself down because that fight was there for me to win...
...I got complacent for a split second and I paid the price. It's world class boxing so I have to eradicate that from my game. But, I hope the fans stick with me, I hope they carry on supporting me and I'll certainly do them proud as quickly as possible."
In a few hours Nottingham's Carl Froch will come face to face with George Groves for the final time, before they meet in the biggest boxing bout in post-war history.
The fighters will weigh-in this afternoon at Wembley Arena, ahead of their title fight in front of 80 thousand people at Wembley Stadium tomorrow.
Our Sports Correspondent Steve Clamp sent this report.
The Nottingham boxer, Carl Froch, has been taunted by his world title rival, George Groves, at a press conference in London, as Groves decorated a cardboard cut-out of Froch with a Chelsea FC scarf.
Froch, a Nottingham Forest supporter, faces Groves for the second time on May 31 at Wembley Stadium, after he won their first fight after a controversial ninth round stoppage.
A total of 60,000 tickets for the hotly-anticipated rematch between Carl Froch and George Groves were sold within just one hour of going on sale.
The pair came face-to-face for the first time since Froch was controversially named winner of the WBA and IBF World Super Middleweight championship in November.
The rematch will be held at Wembley on May 31.
Carl Froch's trainer says the Nottingham boxer used the pre-fight press conference to psych himself up, ahead of the fight against George Groves in May.
Froch pushed Groves away as the pair came to face to face in front of the cameras for the first time since Froch controversially beat his rival in their first fight in November.
Rob McCracken, who is from Birmingham, says Carl Froch is in a good way mentally, and does not predict any more clashes before the fight at the end of May.
George Groves has called Carl Froch's behaviour in today's press conference 'childish' and 'shocking'.
His response stokes the fire that is building between the pair for a second time, ahead of their rematch on 31 May.
Groves was commenting after Froch pushed him when they were facing up to each other for the cameras at the pre-fight press conference.
Carl Froch has explained his push on George Groves at today's press conference, saying he was aggravated at Groves 'invading his space'.
The Nottingham fighter went on to tell ITV News correspondent Steve Clamp that he was mentally still in a good place.
Tempers ran high at the pre-fight press conference between Carl Froch and George Groves, as the Nottingham boxer pushed Groves away when the pair came face to face.
Froch refused to look Groves in the eye when the fighters were asked to face up, and when they went out on to the Wembley pitch, tempers threatened to get out of control.
Warning: This video contains flash photography
Tickets for the rematch between Nottingham's Carl Froch and George Groves have sold out within an hour.
They went on sale this today, as the pair came face to face at the pre-fight press conference at Wembley Stadium, where the fight will take place in May.
Nottingham boxer Carl 'The Cobra' Froch and rival George Groves will come face to face today - at a press conference publicising their highly anticipated rematch.
The showdown second fight has been scheduled for May 31 at Wembley Stadium, with tickets on sale today.
When the pair met in November their world title fight was controversially stopped by the referee in the ninth round.
At that point, Froch, the current IBF and WBA super-middleweight champion, was down on points. The stoppage was greeted with boos from the crowd.
'The Cobra', as Carl is known in the boxing world, defended the referee's decision, saying it was "right" to stop the fight.
When the rematch was announced last month, Froch said he was "excited" about it.
Both fighters and their trainers Robert McCracken MBE and Paddy Fitzpatrick will attend the press conference at Wembley Stadium today, along with show promoter Eddie Hearn.