Union J were saved from elimination after finding themselves in the bottom two for the second time on Sunday night.
They are the only group remaining after being forced to sing for survival against fellow boy band District 3.
Mentor Louis Walsh dramatically refused to vote to send either act home - both groups were in his category - leaving it to the other three judges to decide who stayed.
Gary Barlow and Nicole Scherzinger voted to save Union J, who performed Fix You by Coldplay on Saturday night.
Speaking after the performance, Gary Barlow told the band: “I thought you all sang it really well. You just look right guys. It’s like we are witnessing something big about to happen.”
The family and friends of Union J star Jamie Hamblett spoke out last week to encourage residents to vote for the group.
His dad, Paul Hamblett, said: “Words can’t describe how we would feel if they were to win the competition. It’s something that they want badly. We want to give the band the support they deserve.”
Jamie, 24, has worked in the racing industry in Newmarket since the age of 16 for trainers including Sir Michael Stoute, Ed Vaughan and John Gosden.
Trainer Michael Bell took to his Twitter page to urge the racing community to vote for the boys.
He told the Journal: “It’s great to have a bit of added interest in the town and I’m sure that any floating voters keen on racing will be picking up the phone and dialing their number.”
Follow the band on Twitter @UnionJworld