MK1 have become the third act to be sent home from the 'X Factor' after they failed to survive a deadlock against Gary Barlow's act Kye Sones.
Louis Walsh's urban act MK1 performed The Script's 'The Man Who Can't Be Moved' in the sing-off, while chimney sweep Kye Sones sang Bonnie Raitt's 'I Can't Make You Love Me'.
The decision of who to send home went to deadlock after Tulisa chose to save MK1.
She said: "The second I saw you guys I connected you with N-Dubz... if I don't stick up for my urban N-Dubz routes I'd be lying to myself... I'm sorry the act I'm sending home is Kye."
MK1 on the X Factor Eight acts now remain in the competition, including controversial act Rylan Clark who continues to wind Gary Barlow up.
Saturday night's show saw the contestants perform Club Classics, with Jahmene Douglas putting in an emotional performance and James Arthur also wowing the judges.
Overnight ratings figures showed BBC1's 'Strictly Come Dancing' was 1.3 million ahead, as 'X Factor' stumbled by losing 200,000 viewers in a week.
The dance contest maintained its average audience of 9.9 million - the same as last week - while the ITV1 show was at 8.6 million, even including viewers of its catch-up +1 channel.
The 'X Factor' has struggled to match its audience numbers for last year, with last night's show down 1.5 million on the equivalent programme for 2011.